p-trap: a formed piece of pipe, installed below fixtures (sinks, tubs, showers, etc.), which retains a small amount of water to create a seal that prevents sewer gases from entering the house through the drain lines.
P-Trap
p-trap: a formed piece of pipe, installed below fixtures (sinks, tubs, showers, etc.), which retains a small amount of water to create a seal that prevents sewer gases from entering the house through the drain lines.