Think You Know Plumbing? Test Your Skills with Our Quiz!ShareFacebookPinterestTwitterMailHow can you tell if a shut-off valve has a ceramic disc?43%Next Correct Incorrect Shut-off valves with ceramic discs only need a quarter turn to operate, unlike those with rubber discs. How can you tell if a shut-off valve has a ceramic disc? It breaks easily It\"s smaller It moves a quarter turn It\"s a different color 43%