What is P-Trap?
A P-trap is a U-shaped pipe under plumbing fixtures that holds water to prevent sewer gases from entering buildings.
Definition
A P-trap is a U-shaped curved section of pipe installed under sinks and other similar fixtures. It looks like a P on its side, which traps water and allows it to retain a small amount of water after use, forming a barrier that stops sewer gases from traveling back up into the building through the drain.
Purpose
A P-trap is designed to stop unpleasant sewer gases from coming back up through the plumbing and into indoor spaces. It does this by holding a small amount of water in its curved section, which acts as a barrier and blocks those gases from passing through.
Examples of Use
Under bathroom sinks, P-traps are fitted to keep foul smells from rising up through the drain. The same setup is used under kitchen sinks, where it allows wastewater to flow out while still keeping gases contained. In bathtubs and showers, the trap is built into the drainage line, helping maintain that water seal so odors don’t make their way back into the room.
Related Terms
Notes
- A P-Trap is a U-shaped pipe installed under plumbing fixtures that retains water to form a seal against sewer gases.
- It prevents foul odors and harmful gases from entering indoor spaces through the drainage system.
- The water held in its curved section acts as a natural barrier while still allowing wastewater to flow out.
- P-Trap is used under sinks, bathtubs, and showers for maintaining hygiene and proper plumbing function.
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