The crossword solution for the term 'Drainpipe Feature' is 'TRAP'. A TRAP is a type of plumbing fixture that is designed to prevent sewer gases from entering a building. It is usually installed at the lowest point of a drainpipe and contains a curved section of pipe that retains a small amount of water, which acts as a seal against the gases. Traps are an important part of any plumbing system and are essential for ensuring the safety of the occupants of a building.