ROUGHPLUMB VISUAL PLUMBING LIBRARY

Search plumbing visually.

Describe what you see or what your plumbing is doing. You do not need to know the plumbing term.

10 featured visual guides
Why Your Toilet Has a Weak Flush
ProblemsProblem
VISUAL KEY

Why Your Toilet Has a Weak Flush

Trace a weak flush through tank water level, flapper action, bowl passages and possible restriction.

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Why Is My Toilet Gurgling?
ProblemsProblem
VISUAL KEY

Why Is My Toilet Gurgling?

One-fixture and multiple-fixture gurgling point the investigation in different directions.

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Inside a Toilet Tank
AssembliesAssembly
VISUAL KEY

Inside a Toilet Tank

Identify the fill valve, float, overflow, flapper, flush valve, lever and chain.

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Toilet Flapper
PartsPart
VISUAL KEY

Toilet Flapper

See how the flapper seals the flush valve and why a poor seal can cause refilling.

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Toilet Fill Valve
PartsPart
VISUAL KEY

Toilet Fill Valve

Identify the fill valve and understand its role in tank refill and water level.

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Toilet Flange
PartsPart
VISUAL KEY

Toilet Flange

Understand the flange, finished-floor relationship and why elevation matters.

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Toilet Wax Ring
PartsPart
VISUAL KEY

Toilet Wax Ring

See where the toilet-to-flange seal sits and what a compromised sealing path can look like.

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Toilet Leaking at the Base
FailuresFailure
VISUAL KEY

Toilet Leaking at the Base

Separate tank, supply, sealing-area and external-water paths before assuming the wax seal failed.

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RP-ASM-002Bathroom Sink Drain PlumbingSIMPLIFIED SYSTEM CONCEPT
AssembliesAssembly
VISUAL KEY

Bathroom Sink Drain Plumbing

Follow the basin, pop-up, tailpiece, P-trap, trap arm and wall drain.

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RP-DIA-004Bathroom Sink Drains SlowlySIMPLIFIED SYSTEM CONCEPT
ProblemsProblem
VISUAL KEY

Bathroom Sink Drains Slowly

Start near the stopper and work downstream through the tailpiece, trap and trap arm.

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Pop-Up Drain Assembly
AssembliesAssembly
VISUAL KEY

Pop-Up Drain Assembly

Identify the stopper, drain body, pivot rod, lift mechanism and tailpiece.

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Trap Arm
PartsPart
VISUAL KEY

Trap Arm

See the section of drainage piping that carries flow from the trap toward the drainage/vent system.

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RP-FAIL-002S-Trap vs P-TrapSIMPLIFIED SYSTEM CONCEPT
FailuresFailure
VISUAL KEY

S-Trap vs P-Trap

Compare the layouts and understand why trap-seal protection and venting matter.

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RP-MEA-002Correct Drain-Pipe SlopeSIMPLIFIED SYSTEM CONCEPT
MeasurementsMeasurement
VISUAL KEY

Correct Drain-Pipe Slope

Understand why drainage needs appropriate grade and why code values depend on pipe size and jurisdiction.

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RP-ASM-005Double-Bowl Kitchen Sink PlumbingSIMPLIFIED SYSTEM CONCEPT
AssembliesAssembly
VISUAL KEY

Double-Bowl Kitchen Sink Plumbing

See where both bowls join before the trap and how a shared restriction can affect both bowls.

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RP-DIA-005Kitchen Sink Backing UpSIMPLIFIED SYSTEM CONCEPT
ProblemsProblem
VISUAL KEY

Kitchen Sink Backing Up

Whether one bowl or both bowls react helps locate the restriction.

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Basket Strainer
PartsPart
VISUAL KEY

Basket Strainer

Identify the strainer assembly and common leak points around the sink opening.

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RP-ASM-006Dishwasher Drain ConnectionSIMPLIFIED SYSTEM CONCEPT
AssembliesAssembly
VISUAL KEY

Dishwasher Drain Connection

See how dishwasher discharge joins the sink drainage system and why routing matters.

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RP-MEA-003Kitchen Sink Drain Too HighSIMPLIFIED SYSTEM CONCEPT
MeasurementsMeasurement
VISUAL KEY

Kitchen Sink Drain Too High

A deeper sink can reduce the elevation available for the trap and wall connection.

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RP-PLAN-001Deeper Sink vs Existing PlumbingSIMPLIFIED SYSTEM CONCEPT
MeasurementsPlanning
VISUAL KEY

Deeper Sink vs Existing Plumbing

Check basket outlet, trap elevation, disposal depth and wall drain before buying.

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RP-DIA-006Leak Under Kitchen SinkSIMPLIFIED SYSTEM CONCEPT
ProblemsProblem
VISUAL KEY

Leak Under Kitchen Sink

Separate pressurized supply leaks from drain leaks and faucet-hose leaks.

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Bathtub Leaking Through Ceiling
ProblemsProblem
VISUAL KEY

Bathtub Leaking Through Ceiling

Use when-the-leak-happens clues to separate supply, enclosure, overflow and drain paths.

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RP-DIA-008Test a Tub Overflow for LeaksSIMPLIFIED SYSTEM CONCEPT
ProblemsProblem
VISUAL KEY

Test a Tub Overflow for Leaks

Isolate the overflow from the lower drain path with controlled testing.

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RP-ASM-008What's Under a Bathtub?SIMPLIFIED SYSTEM CONCEPT
AssembliesAssembly
VISUAL KEY

What's Under a Bathtub?

Cutaway view of the drain shoe, overflow, trap, trap arm, framing and ceiling below.

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Bathtub P-Trap
PartsPart
VISUAL KEY

Bathtub P-Trap

Understand why the tub trap is usually concealed below the fixture.

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RP-DIA-009Bathtub Drains SlowlySIMPLIFIED SYSTEM CONCEPT
ProblemsProblem
VISUAL KEY

Bathtub Drains Slowly

Check the stopper/drain opening first, then move toward the trap and downstream drainage.

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Shower Drain Assembly
AssembliesAssembly
VISUAL KEY

Shower Drain Assembly

See the shower drain in context with the base, drain body, piping and trap.

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Shower Cartridge
PartsPart
VISUAL KEY

Shower Cartridge

The cartridge is a serviceable component inside the valve body—not the entire valve.

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Shower Diverter
PartsPart
VISUAL KEY

Shower Diverter

See how a diverter redirects water between tub and shower outlets.

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Low Shower Pressure
ProblemsProblem
VISUAL KEY

Low Shower Pressure

Compare one-fixture low flow with a whole-house pressure problem.

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RP-DIA-011Shower Won't Get Hot EnoughSIMPLIFIED SYSTEM CONCEPT
ProblemsProblem
VISUAL KEY

Shower Won't Get Hot Enough

Separate local valve/limit-stop issues from whole-house hot-water problems.

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Tub-to-Shower Conversion Plumbing
MeasurementsPlanning
VISUAL KEY

Tub-to-Shower Conversion Plumbing

Plan around drain location, trap access, framing and the room below.

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Moving a Shower Drain
MeasurementsMeasurement
VISUAL KEY

Moving a Shower Drain

Drain position, trap location, joist direction and access determine the real scope.

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Shower Valve on an Exterior Wall
FailuresFailure
VISUAL KEY

Shower Valve on an Exterior Wall

Understand cold-climate freeze and service-access concerns before choosing the wall.

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Ball Valve vs Gate Valve
PartsPart
VISUAL KEY

Ball Valve vs Gate Valve

Identify common shutoff styles and how their operating mechanisms differ.

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RP-PART-013Pressure-Reducing Valve (PRV)SIMPLIFIED SYSTEM CONCEPT
PartsPart
VISUAL KEY

Pressure-Reducing Valve (PRV)

Identify a PRV and understand its role in controlling downstream water pressure.

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How to Check House Water Pressure
MeasurementsMeasurement
VISUAL KEY

How to Check House Water Pressure

Use a suitable pressure gauge and a full-flow test point to establish a useful baseline.

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Low Water Pressure in House
ProblemsProblem
VISUAL KEY

Low Water Pressure in House

Trace whole-house low pressure through valves, regulator, filters, service and supply conditions.

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Water Pressure Too High
ProblemsProblem
VISUAL KEY

Water Pressure Too High

Recognize high-pressure clues and understand why regulation matters.

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Faucet Aerator
PartsPart
VISUAL KEY

Faucet Aerator

A small restriction at the aerator can make one faucet look like a whole-house pressure problem.

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Braided Supply Line
PartsPart
VISUAL KEY

Braided Supply Line

Identify flexible supply connectors and common connection/seal points.

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Fixture Shutoff / Angle Stop
PartsPart
VISUAL KEY

Fixture Shutoff / Angle Stop

Locate the local shutoff serving a toilet, faucet or fixture before service.

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RP-PART-017Water Supply Stub-OutSIMPLIFIED SYSTEM CONCEPT
PartsPart
VISUAL KEY

Water Supply Stub-Out

See where concealed distribution piping transitions to an accessible fixture connection.

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RP-SYS-001PEX vs CopperSIMPLIFIED SYSTEM CONCEPT
How It WorksSystem
VISUAL KEY

PEX vs Copper

Compare the two common water-distribution materials without treating either as universally best.

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RP-PART-018PEX Crimp ConnectionSIMPLIFIED SYSTEM CONCEPT
PartsPart
VISUAL KEY

PEX Crimp Connection

See the pipe, fitting and ring relationship in a typical crimp connection.

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RP-FAIL-004Corroded PEX RingsSIMPLIFIED SYSTEM CONCEPT
FailuresFailure
VISUAL KEY

Corroded PEX Rings

Recognize corrosion around metallic connection rings and inspect the surrounding environment.

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RP-FAIL-005Copper Pinhole LeakSIMPLIFIED SYSTEM CONCEPT
FailuresFailure
VISUAL KEY

Copper Pinhole Leak

Understand what a pinhole leak looks like and why the surrounding piping condition matters.

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RP-DIA-014Supply Leak vs Drain LeakSIMPLIFIED SYSTEM CONCEPT
ProblemsProblem
VISUAL KEY

Supply Leak vs Drain Leak

Timing is a major clue: pressurized piping can leak without fixture use; drainage leaks often need flow.

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RP-DIA-015Trace a Hidden Plumbing LeakSIMPLIFIED SYSTEM CONCEPT
ProblemsProblem
VISUAL KEY

Trace a Hidden Plumbing Leak

Use controlled fixture tests, moisture patterns and accessible inspection before opening finishes.

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RP-MEA-006Water Meter Leak TestSIMPLIFIED SYSTEM CONCEPT
MeasurementsMeasurement
VISUAL KEY

Water Meter Leak Test

Use the meter as one clue for continuous water loss after intentional water use is stopped.

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RP-SYS-002Emergency Pipe Leak IsolationSIMPLIFIED SYSTEM CONCEPT
How It WorksSystem
VISUAL KEY

Emergency Pipe Leak Isolation

Shut down the water source, protect the area and identify whether the damaged line can be isolated safely.

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RP-DIA-016Washing Machine Drain Backs UpSIMPLIFIED SYSTEM CONCEPT
ProblemsProblem
VISUAL KEY

Washing Machine Drain Backs Up

If only the standpipe reacts, look locally; multiple fixtures reacting points farther downstream.

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RP-SYS-003Washer Drain Suds ZoneSIMPLIFIED SYSTEM CONCEPT
How It WorksSystem
VISUAL KEY

Washer Drain Suds Zone

High-volume detergent-rich discharge needs a drainage layout that does not push suds into nearby connections.

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RP-PART-019Washing Machine Supply HosesSIMPLIFIED SYSTEM CONCEPT
PartsPart
VISUAL KEY

Washing Machine Supply Hoses

Identify hot/cold hoses, shutoffs and connection points that deserve periodic inspection.

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RP-MEA-007Laundry Drain HeightSIMPLIFIED SYSTEM CONCEPT
MeasurementsMeasurement
VISUAL KEY

Laundry Drain Height

Standpipe and hose requirements vary by appliance and plumbing jurisdiction; verify both before altering the setup.

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RP-DIA-017Sewer Smell Near Washing MachineSIMPLIFIED SYSTEM CONCEPT
ProblemsProblem
VISUAL KEY

Sewer Smell Near Washing Machine

Separate appliance odor from standpipe/trap/vent drainage odor before treating the wrong source.

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Blocked Plumbing Vent Symptoms
ProblemsProblem
VISUAL KEY

Blocked Plumbing Vent Symptoms

Gurgling and trap-seal problems can involve venting, but similar symptoms can also come from drainage restrictions.

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RP-FAIL-006Sagging Vent Pipe Holding WaterSIMPLIFIED SYSTEM CONCEPT
FailuresFailure
VISUAL KEY

Sagging Vent Pipe Holding Water

A poorly supported horizontal vent can retain water and interfere with air movement.

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Why Multiple Fixtures Gurgle
ProblemsProblem
VISUAL KEY

Why Multiple Fixtures Gurgle

When several fixtures react, investigate shared drainage/venting rather than treating each fixture independently.

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What Causes Sewer Gas Smell?
ProblemsProblem
VISUAL KEY

What Causes Sewer Gas Smell?

Dry or compromised traps, drainage/vent problems and other openings can allow odors into occupied space.

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Air Admittance Valve (AAV)
PartsPart
VISUAL KEY

Air Admittance Valve (AAV)

An AAV admits air under appropriate conditions; installation and permission depend on the applicable code.

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Plumbing Cleanout
PartsPart
VISUAL KEY

Plumbing Cleanout

Identify an access point intended for inspection and drain-cleaning equipment.

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RP-SYS-005Main House DrainSIMPLIFIED SYSTEM CONCEPT
How It WorksSystem
VISUAL KEY

Main House Drain

Follow fixture branches toward the building drain and sewer/septic connection.

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Signs of a Main Sewer Clog
ProblemsProblem
VISUAL KEY

Signs of a Main Sewer Clog

Multiple low fixtures backing up or reacting together can indicate a problem beyond one fixture.

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Fixture Clog vs Main Sewer Clog
ProblemsProblem
VISUAL KEY

Fixture Clog vs Main Sewer Clog

Use how many fixtures are affected and where they are located to judge the likely scope.

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Backwater Valve
PartsPart
VISUAL KEY

Backwater Valve

See how a backwater valve is intended to resist reverse flow from a drainage system.

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House Drain to Municipal Sewer
How It WorksSystem
VISUAL KEY

House Drain to Municipal Sewer

Follow the building drain, building sewer and public connection conceptually.

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House Drain to Septic Tank
How It WorksSystem
VISUAL KEY

House Drain to Septic Tank

See the building drain route toward a private septic system and why elevation matters.

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Basement Drain Elevation on Septic
MeasurementsPlanning
VISUAL KEY

Basement Drain Elevation on Septic

A basement fixture must have a viable route to the receiving system; never assume gravity drainage is available.

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RP-ASM-012Sump Pump SystemSIMPLIFIED SYSTEM CONCEPT
AssembliesAssembly
VISUAL KEY

Sump Pump System

Understand the pit, pump, discharge and check-valve concept without confusing sump water with sanitary drainage.

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Floor Drain & Trap Primer
AssembliesAssembly
VISUAL KEY

Floor Drain & Trap Primer

See how a floor-drain trap seal can be maintained in systems that use a trap primer.

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Why a Floor Drain Smells
ProblemsProblem
VISUAL KEY

Why a Floor Drain Smells

A dry trap is common, but persistent odor deserves investigation of the drainage and trap-seal system.

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Water Heater Plumbing Connections
AssembliesAssembly
VISUAL KEY

Water Heater Plumbing Connections

Identify the basic cold inlet, hot outlet, relief system and drain components; fuel-specific details vary.

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Water Heater Shutoffs
How It WorksSystem
VISUAL KEY

Water Heater Shutoffs

Know which water and energy controls apply to your heater before an emergency; systems vary by fuel/type.

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T&P Relief Valve
PartsPart
VISUAL KEY

T&P Relief Valve

Understand the safety role of the temperature-and-pressure relief valve and discharge path.

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Water Heater Drain Pan
AssembliesAssembly
VISUAL KEY

Water Heater Drain Pan

See how a pan can help manage leakage where an approved drainage path is provided.

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Water Heater Expansion Tank
PartsPart
VISUAL KEY

Water Heater Expansion Tank

Understand why some closed water systems use thermal-expansion control.

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Water Heater Relief Valve Leaking
ProblemsProblem
VISUAL KEY

Water Heater Relief Valve Leaking

Do not plug or cap a relief discharge; investigate temperature, pressure and system conditions.

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Vanity Drain Rough-In Height
MeasurementsMeasurement
VISUAL KEY

Vanity Drain Rough-In Height

Plan the drain around the actual vanity, sink, trap and drawer configuration—not a generic dimension alone.

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RP-FAIL-007Vanity Drawers Hit the PlumbingSIMPLIFIED SYSTEM CONCEPT
FailuresFailure
VISUAL KEY

Vanity Drawers Hit the Plumbing

Modern drawer layouts can conflict with an existing drain or trap even when the vanity width fits.

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Moving a Vanity Sink
MeasurementsPlanning
VISUAL KEY

Moving a Vanity Sink

Consider drain elevation, venting, supplies, studs and drawer geometry before moving the fixture.

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Bathroom Plumbing Rough-In
AssembliesAssembly
VISUAL KEY

Bathroom Plumbing Rough-In

See a simplified relationship among toilet, vanity, tub/shower, water supplies, drainage and venting.

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RP-SYS-009Plumbing Inside a Bathroom WallSIMPLIFIED SYSTEM CONCEPT
How It WorksSystem
VISUAL KEY

Plumbing Inside a Bathroom Wall

Understand the concealed supplies, drains, vents and fixture connections before opening a wall.

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Drain Pipe Through Floor Joists
MeasurementsPlanning
VISUAL KEY

Drain Pipe Through Floor Joists

Drain routing is constrained by framing; structural modifications require appropriate design and code compliance.

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RP-SYS-010Why Drain Elevation MattersSIMPLIFIED SYSTEM CONCEPT
How It WorksSystem
VISUAL KEY

Why Drain Elevation Matters

Gravity drainage needs usable vertical relationships between fixture outlets, traps and downstream piping.

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Vent Connection & Flood-Rim Concept
MeasurementsMeasurement
VISUAL KEY

Vent Connection & Flood-Rim Concept

Understand the flood-rim concept; exact vent connection rules are jurisdiction- and system-specific.

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RP-SYS-011Common Household Pipe TypesSIMPLIFIED SYSTEM CONCEPT
How It WorksSystem
VISUAL KEY

Common Household Pipe Types

Identify common water and drainage materials before planning a repair or connection.

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Toilet Flange Too High or Too Low
MeasurementsMeasurement
VISUAL KEY

Toilet Flange Too High or Too Low

Compare flange elevation to the finished floor and understand why flooring changes can create problems.

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Toilet Refills Every Few Minutes
ProblemsProblem
VISUAL KEY

Toilet Refills Every Few Minutes

Intermittent refill usually means tank water is being lost somewhere; inspect the sealing path before adjusting the fill valve.

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RP-FAIL-008Backgraded Drain PipeSIMPLIFIED SYSTEM CONCEPT
FailuresFailure
VISUAL KEY

Backgraded Drain Pipe

A drain that falls the wrong direction can retain water and contribute to poor drainage.

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