Comprises 2 three’ charging hoses and lowside snap coupler. Used for 134a techniques. Eliminate the lowside snap coupler to be used with R12 and R22 techniques. Works with Enviro-Protected cylinders. This manifold is used with Enviro-Protected tanks of refrigerants and with R134a techniques. It CANNOT be used with Enviro-Protected Refrigerant small cans with out buying further pieces.