Why Is There a Bend Under Your Sink? | P-Traps Explained
Why does a sink drain dip into a bend before reaching the wall? The low section keeps water behind, creating a seal while letting wastewater flow through.
Follow one P-trap as water passes through, settles, and then slowly evaporates. A cutaway shows how the seal blocks an open air path, what happens when the water level falls, and how a vent helps protect the seal from pressure changes. The alternate pipe route and moving water/gas marks are simplified illustrations, not installation advice.
Video Summary
AI GeneratedThis video explains the function and mechanics of the P-trap, the curved pipe found under sinks. It demonstrates how the trap uses a standing pool of water to create a seal that prevents sewer gases from entering a room while still allowing wastewater to flow freely into the drainage system.