The Hayward PSV3S2DGR is a 3-way diverter valve from the PSV Series, built in PVC with 2 in by 2-1/2 in ports. It is the valve for sending flow one way or the other in pool and spa plumbing.
What a 3-way does
A three way valve has one common port and two others, so it can split flow between two lines or switch it fully from one to the other. That is what makes it the standard choice for pool and spa switching, a solar bypass, or a waterfall line that is not always running. A 2-way valve, by contrast, only opens or closes a single line.
Sizing and material
The dual size sockets take 2 in or 2-1/2 in pipe. The body is PVC. Hayward also lists a CPVC version of the same valve under a separate part number for installations that need it.
