Quick Connect, Regulator to Hose, Brass, QDB300 (M) Plug QDB301 (F) Socket, Inert Gas no checkout and taper length for the and taper length for the perfect alignment Black oxide finish for additional rust protection Heavy duty protection for the toughest applications Palm is 50% thicker than most standard flock lined gloves Increased tensile strength and puncture protection against chemical and physical hazards Cotton flock lining increases user comfort Recessed diamond design provides grip on wet or dry objects Brass construction provides long service life Non interchangeable oxygen and fuel gas connectors Instant closure on reverse flow check valves Spring loaded locking mechanism responds to fingertip action and achieves a gas tight connection Double seal socket connection on second seal