The Griswold Controls 2000P is a 4" Heavy Duty Solenoid Control Valve. For maximum durability and performance, no other remote control irrigation valve can compare! Griswold Controls’ unique design allows the 2000 Series valve line to serve dependably under the most adverse conditions. Designed to resist most water–borne contaminants such as dirt, algae and other organic and inorganic materials, the 2000 Series’ self–flushing design allows most foreign materials to harmlessly pass through the valve without impeding its operation.