* Mounted On The Geyser Towards Often On The Opposite Side To The Drain Cock. * This Is A Vital Component. * This Valve Should Have A 20 Mm Metal (Copper) Pipe Connected To It And The Pipe Must Lead Directly Out The Building. * This Vent An Important Safety Feature Of The Whole System. * It Must Be Made Of Copper ? Not Plastic. * The Pressure Rating Valve Must Match The Pressure Rating On The Geyser.
