Core plumbing code vocabulary used across the Uniform Plumbing Code and International Plumbing Code exams.
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- What is a P-trap?
- A U-shaped trap with the outlet horizontal, the most common trap type found under sinks.
- What is an S-trap?
- A trap with both inlet and outlet in vertical alignment, now prohibited in many jurisdictions.
- What is a vent stack?
- A vertical pipe conveying air and gases from the drainage system to the atmosphere.
- What is the rough-in phase?
- The initial installation stage where pipes are installed before fixtures are connected and walls are closed.
- What is a cleanout?
- A removable access point installed in the drainage system for clearing blockages and inspections.
- What is an air gap?
- An open vertical distance between a fixture outlet and drain inlet, preventing backflow and contamination.
- What is backflow?
- The reverse movement of contaminated water or gas in a plumbing system, from higher to lower pressure.
- What is pitch in drainage piping?
- The slope of a drainage pipe, typically a minimum of 1/4 inch drop per foot of horizontal run.
- What is trap seal?
- The water depth inside a trap that blocks sewer gases from entering the building, typically minimum 2 inches.
- What is an elbow fitting?
- A fitting that changes the direction of pipe, typically at 45 degrees or 90 degrees.
- What is a tee fitting?
- A three-outlet fitting in the shape of the letter T, used to connect three pipes.
- What is a wye fitting?
- A three-outlet fitting in the shape of the letter Y, connecting three branches at angled intersections.
- What is a coupling?
- A fitting that joins two pipes of the same size, usually with threads or solder.
- What is an escutcheon?
- A decorative ring or collar that covers the gap where a pipe penetrates a wall or fixture.
- What is a water closet?
- The formal plumbing code term for a toilet.
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