Union | Socket Weld x Threaded | Male National Pipe Thread (MNPT) | Sweat | Threaded x Threaded | Threaded | 1-1/2" x 1" | 1-1/4" x 1-1/4" | 1-1/4" x 1-1/4" x 1" | 1-1/4" x 3/8" | 3/8" x 1/4" | 3/8"