Think You Know Plumbing? Test Your Skills with Our Quiz!ShareFacebookPinterestTwitterMailWhat"s the function of a high loop?65%Next Correct Incorrect A high loop ensures there"s a gap between the dishwasher and sink water lines, stopping dirty water from flowing back. What"s the function of a high loop? Prevents dirty water from being pulled back into a dishwasher Connect a garbage disposal to a sink Holds up a sink hose Operates a sink-sprayer 65%