Couplings | Insert Barb x Insert Barb x Insert Barb | Male National Pipe Thread (MNPT) | Socket Weld x Threaded | Sweat x FIP | Sweat x MIP | Threaded x Threaded | Threaded | 1-1/2" | 1/2" x 1/8" | 1" x 1/2" | 2" x 1/2" | 3/8" x 1/4"