SMOOTH PRESSURE, NO SURGES: With 40 psi Output for Cleaner, More Controlled Spray Performance. The KREG-IT4001 delivers steady 40 psi to eliminate pressure spikes, reduce misting, and optimize spray performance. Its 1 in. male inlet and female outlet connect easily to standard systems. The 1 in. MPT inlet x 1 in. FPT outlet has standard thread compatibility. You can use the the 40 psi regulator with Poly, PVC, on valves and many other applications. The internal regulator ensures smooth output across a wide flow range which designed to eliminate downstream surges. They are ideal for drip zones, spray heads, and small rotors. Everything is regulated internally with no external components.