Waterway Plastics TruSeal Swing Check Valves & 3" Check Valve, 2" Socket x 2 1/2" Spigot - Straight Body - CPVC. Waterway Check Valves have a clear lid with union lock ring and a bright seal flapper for easy inspection and quick access. The Waterway Check Valves have the swing design to be used for both return and intake water. CPVC Hi-Temp plastic body which features deeper sockets than others for better glue joints, and is available in a straight body or 90 degree style. Features: Union Lock Ring allows for easy access - no screw holes to strip out (excludes 600-0111); Seal flapper is made of hi-tech thermoplastic polymer; Corrosion proof pin and stainless steel spring; Reversible flow; CPVC body for most demanding applications; Low Back Pressure and High Flow characteristics make it perfect for hydraulically demanding applications.