Hex Pipe Locknuts | Insert Barb x Insert Barb x Insert Barb | Male National Pipe Thread (MNPT) | Socket Weld x Threaded | Threaded x Threaded | Threaded | 1-1/2" | 1-1/4" x 1-1/4" | 1-1/4" x 1" x 1" | 3/8" x 1/4" | 3/8" x 1/8" | 3"