Reelcraft TW7450 OLP spring retractable gas welding hose reels have an independent dual swivel body manufactured from aluminum and hard coated for wear resistance. This unique design assures positive separation of gases. Double-sealed, special molded O-rings prevent leakage. Swivel body and inlet are both permanently identified with machined grooves on the acetylene side to assure proper installation. *For oxygen / acetylene only*