Quick Connect, Regulator to Hose, Brass, QDB300 (M) Plug QDB301 (F) Socket, Inert Gas ORS NASCO Soft rubber cap is skid resistant Soft rubber cap is skid resistant and provides protection and flexibility Compression recovery 1 2 in neoprene foam padding provides firm and apply to leaking pipes or damaged equipment Certified and approved for use with drinking water system components 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