Reduce the water pressure from the water source with the pressure regulator. When used properly, it helps prevent excessive pressure from blowing out emitters and fittings, and potentially damaging the drip system. This pressure regulator is preset at 30 PSI and has flow range from 0.1 to 8 GPM. An arrow pointing in the direction of water flow is printed on the body. The pressure regulator connects to 3/4 in. MPT; use with an adapter to make other types of connections. Made of ABS.