In plumbing, a closet flange is a pipe fitting (specifically, a type of flange) that both mounts a toilet to the floor an connects the toilet drain to a drain pipe. The name comes from the term "water closet", the traditional name for a toilet. A typical closet flange is composed of an ABS or PVC hub with a round steel mounting flange attached to the top. Other styles are made from copper, brass, stainless steel, or pure plastic.