Shopper Hi. Is this a 300 bar DIN or 200 bar DIN?
BLAYNE S I is a 200Bar din connection. You will need the adapter to go from 200 bar to 300 bar if that is what the tank valve is. part number for that item is
ScubaPro "300 bar" Din Conversion Kit for MK16, MK18, MK20 & MK25
SKU: SCPDC3