Air Gun Charging Valve with EN-144-1/M25x2 Cylinder Thread with EN-144-3 type 300 Bar G 5/8” DIN outlet fitting. With purge valve, and built in extra durable pressure gauge displaying pressure between 0 and 400 Bar and 0 to 5800 psi. Suitable for use with standard European 300 Bar SCUBA Diving Cylinders, use with Airgun Charging Set (AG CS) to charge Air Guns fitted with 1/8" or 1/4" Male or Female BSP Fittings.