Seamless, deep drawn aluminum alloy body, ensures maximum sealing and, thanks to its light weight, perfect handling. Externally painted with polyester resin. Squeeze grip lever operated valve with acetal resin body, ensuring perfect protection against corrosion. The shock-proof pressure gauge is equipped with a non-return valve to allow pressure control and with a sintered filter to protect sensitive parts. The propellant gas is nitrogen. A small percentage of helium is added, to allow electronic leak detection.