Lower the water pressure from the water source for optimal drip system performance with the pressure regulator. When used properly, it helps keep emitters and fittings from popping off by reducing excessive pressure. This pressure regulator is preset at 30 PSI. The device has a flow range from 2 to 20 GPM. Use the arrow printed on the body to position in the direction of water flow. The device connects to 3/4 in. MPT; use with an adapter to make other types of connections. Made of ABS.