Coupling | Compression Coupling | Hex Reducer Bushings | Insert Coupling | Reducer Coupling | Rubber Cap | Rubber Coupling | Threaded Flanges | 1-1/2" x 1-1/2" x 3/4" | 1/2" x 3/8" | 1" x 1" x 1/2" | 2-1/2" x 2" | 2" x 1/4"