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