Unions | Compression | Socket Weld x MIP | Threaded True Union | Threaded x Threaded | Threaded | 150lb | 1-1/4" x 1-1/4" | 2" | 3/8"-5/16"-18 | 5" - 3" x 1-1/2" | 6" x 1" | 6" x 4"