Pipe, Fittings, and Flanges | Asc Engineered Solutions | Couplings | Hex Reducer Bushings | Insert Barb x Insert Barb Coupling | 1-1/2" x 1/2" | 1-1/2" | 1" x 3/4" | 1" x 3/8" | 2-1/2" x 2" | 3" x 3/4" | 4" x 1-1/2" | 4" x 2"