Think You Know Plumbing? Test Your Skills with Our Quiz!ShareFacebookPinterestTwitterMailWhy is a drain trap important?78%Next Correct Incorrect A drain trap holds a small amount of water to create a seal that blocks sewer gases from escaping into your home. Why is a drain trap important? It traps food particles in your dishwasher It prevents debris from clogging your drain It helps your septic tank function It keeps unwanted sewer gas from seeping into your home 78%