The high capacity valves, type RA-G, are primarily used in one-pipe systems. All RA-G valves can be combined with all thermostatic sensors in the RA-series. The RA-G valves are fitted with a grey protective cap. This protective cap must not be used as a manual shut off device. A special manual shut off device is available (code no. 013G3300). The pressure pin in the gland seal is of chromium steel and works in a lifetime lubricated O-ring. The complete gland seal assembly can be replaced without draining the system