Coupling | Socket Weld x Threaded | Sweat x MIP | Threaded x Threaded | Threaded | 1-1/4" x 1-1/4" | 1-1/4" x 3/8" | 1" x 1" x 1/2" | 1" x 3 | 2-1/2" | 3/4" x 1/2" | 4" x 2"