Double Check Valve Assemblies | Insert Barb x Insert Barb | Insert Barb x MIP | Threaded x Threaded | Threaded | 1-1/2" x 1-1/4" | 1-1/2" x 3/4" | 1-1/4" x 1-1/4" | 2" | 3/4" x 3/8" | 3/8"-5/16"-18 | 3/8" x 1/4" | 20 ounce