Keep your beer's carbonation high and even with this Co2 Primary Gas Valve. 
Easy to install, this regulator comes with a John Guest Push-fit Outlet Port - 3/8" Female. It is designed to be mounted directly onto the gas cylinder or bottle and features a pressure gauge for easy monitoring of CO2 levels. This unit is manufactured to the Code of Practice for the Dispense of Beer by Pressure Systems in Licensed Premises, so you can be sure it's been gone through high levels of safety testing.
Gas Primary valves should be installed and maintained by trained technicians.
Gas vales should be installed and kept with COP paperwork of your own requirements as valve owner and who to call if there is a fault.