This QC4 male connector mates to the female QC4 connector and has a 9/16-18 male fitting for attachment to the 2nd stage end of a standard LP regulator hose. Both male and female QC connectors have a check valve built in. This allows for in water emergency connection or disconnection with minimum water infiltration. Both the male and female QC4 connectors are oxygen compatible.
ATTN: THESE QC4 CONNECTORS HAVE INSUFFICIENT FLOW TO BE USED ON OPEN CIRCUIT (OC) SYSTEMS.