1. Automatically keep high pressure flow (within 15kg) into your low valve range(1 - 6kg). 2. Copper. 3. G1/2" thread. This valve automatically keep high pressure flow (within 15kg) into your lowvalve range (1 - 6kg). If electric water heater is installed in high water pressureenvironment (above 7kg), the safety valve will drip all the time, after installing this device, the water heater can ...