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Exam (elaborations)

Texas Journeyman Plumbing – 400+ Test Questions with Verified Answers – PLMB 401 – Definitions, Fixtures, Drainage, Gas Systems

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This extensive exam prep resource includes over 400 verified multiple-choice questions and answers based on the latest 2025/2026 Texas plumbing code standards, aligned with PLMB 401 (Plumbing Systems and Installation) or equivalent journeyman-level coursework. Covering all critical definitions, calculations, and regulatory requirements, this document is ideal for both academic study and real-world exam preparation. Key content includes plumbing terms and definitions (air gaps, backflow, venting, fixture types), system design (DWV, water heaters, indirect waste, grease and oil interceptors), code-compliant installations (cleanouts, trap seal, pipe bracing, thermal expansion), and gas piping (appliance connectors, combustion air, vent types). It also covers sizing charts for drainage and vent systems, slope requirements, fixture spacing, backwater valves, and safety devices like T&P valves and vacuum relief systems. Special focus is given to Texas state-specific regulations, including accessibility standards, water heater code in attics, pipe penetration sealing, and local adaptations of the IPC. All answers are graded A+ and follow the current licensing criteria for journeyman plumber certification in Texas. This document is useful for: Journeyman plumber candidates preparing for the Texas State Plumbing License Exam Trade school and college students in plumbing, HVAC, or construction-related programs Building code professionals and inspectors working with Texas plumbing installations Plumbing instructors creating compliant study aids or assessments Apprentices and technicians seeking a deeper understanding of systems and terminology With precise language and diagram-free clarity, this guide is your go-to resource for mastering the journeyman plumbing requirements in Texas. Keywords: Texas plumbing exam 2025, PLMB 401, journeyman plumber test, plumbing code terms, backflow prevention, DWV system layout, gas piping code, water heater regulations, fixture unit spacing, IPC code Texas, trap seal, venting standards, cleanout requirements, drainage slope chart, T&P valve specs, appliance connectors

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Journeyman Plumbing Test (Texas)
2025/2026 Exam Questions and Verified
Answers | Already Graded A+



Access (to) - 🧠 ANSWER ✔✔That which enables a fixture, appliance or

equipment to be reached by ready access or by a means that first requires

the removal or movement of a panel, door or similar obstruction.


Air Break (Drainage System) - 🧠 ANSWER ✔✔A piping arrangement in

which a drain from a fixture, appliance or device discharges indirectly into

another fixture, receptacle or interceptor at a point below the flood level rim

and above the trap seal.

,Air Gap (Drainage System) - 🧠 ANSWER ✔✔The unobstructed vertical

distance through the free atmosphere between the outlet of the waste pipe

and the flood level rim of the receptacle into which the waste pipe is

discharging. The distance between the waste pipe outlet and the flood level

rim of the receptor must be at least twice the diameter of the indirect waste

pipe.


Air Gap (Water Distribution System) - 🧠 ANSWER ✔✔The unobstructed

vertical distance through the free atmosphere between the lowest opening

from any pipe or faucet supplying water to a tank, plumbing fixture or other

device and the flood level rim of the receptacle.


Appliance - 🧠 ANSWER ✔✔Any apparatus or device that utilizes a fuel or a

raw material as a fuel to produce light, heat, power, refrigeration or air

conditioning that compresses fuel gases.


Backflow - 🧠 ANSWER ✔✔Pressure created by any means in the water

distribution system, which by being in excess of the pressure in the water

supply mains causes a potential backflow condition.


Backsiphonage - 🧠 ANSWER ✔✔The backflow of potentially contaminated

water into the potable water system as a result of the pressure in the

,potable water system falling below atmospheric pressure of the plumbing

fixtures, pools, tanks or vats connected to the potable water distribution

piping.


Backflow Connection - 🧠 ANSWER ✔✔Any arrangement whereby backflow

is possible.


Backflow Preventer - 🧠 ANSWER ✔✔A backflow prevention assembly, a

backflow prevention device or other means or method to prevent backflow

into the potable water supply.


Bathroom Group - 🧠 ANSWER ✔✔A group of fixtures consisting of a water

closet, lavatory, bathtub or shower, including or excluding a bidet, an

emergency floor drain or both. Such fixtures are located together on the

same floor level.


Branch Interval - 🧠 ANSWER ✔✔A vertical measurement of distance, 8 feet

(2438 mm) or more in developed length, between the connections of

horizontal branches to a drainage stack. Measurements are taken down the

stack from the highest horizontal branch connection.


Branch Vent - 🧠 ANSWER ✔✔A vent connecting one or more individual

vents with a vent stack or stack vent.


COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
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, Building Drain - 🧠 ANSWER ✔✔That part of the lowest piping of a drainage

system that receives the discharge from soil, waste and other drainage

pipes inside and that extends 30 inches (762 mm) in developed length of

pipe beyond the exterior walls of the building and conveys the drainage to

the building sewer.


Code - 🧠 ANSWER ✔✔These regulations, subsequent amendments

thereto or any emergency rules or regulations that the administrative

authority having jurisdiction has lawfully adopted


Combination Waste and Vent System - 🧠 ANSWER ✔✔A specially

designed system of waste piping embodying the horizontal wet venting of

one or more sinks, lavatories, drinking fountains or floor drains by means of

a common waste and vent pipe adequately sized to provide free movement

of air above the flow line of the drain.

Pipe Material / Max Horizontal Bracing / Max Vertical Bracing - 🧠 ANSWER

✔✔ABS / 4ft / 10ft


Cast-Iron / 5ft / 15ft

Copper Tubing (1 1/4 or smaller) / 6ft / 10ft

Copper Tubing (1 1/2 or larger) / 10ft / 10ft

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