Gardena 2760-37 GW 3/4 frost-resistant drain valve Sprinklersystem

Frost-resistant gardena drain valve prevents frost damage to underground plumbing. This is achieved by automatic drainage when the plumbing is not in use; The valve opens when the pressure in the system drops below approximately 0.2 bar. Drain valves should be installed at the lowest point of the irrigation system and should be placed in washed gravel for safe drainage. 3/4" thread.