
Look here at PVC Fittings Direct for those difficult-to-find sized valves like this 2-1/2" Spears swing check true union valve. The ends of this valve are 2-1/2" female pipe thread made to fit with 2-1/2" male pipe thread fittings. It is made to prevent backflow using a flap door that allows flow to only go in one direction.
Nominal Size: 2-1/2"
Material: PVC, EPDM Seals
End Type: Female Threaded (NPT)
Pressure Rating (Open): 150 psi @ 73F Full Flow
Pressure Rating (Closed): 75 psi Back Pressure
*Standard 2-1/2" nominal size male threaded (NPT) PVC fittings fit inside both ends of this valve.