The Faithfull Butane Propane Mix Gas Cartridges are fitted with standard type EN417 threaded self-sealing safety valves. They are suitable for use with Faithfull and all other blow torches fitted with an EN417 fitting. These cartridges may also be used with blow torches fitted with a CGA600 fitting, using a Faithfull valve converter, product code: FAIGZCONVERT.