Drain Valve Backflow Check Valve Water PVC Inner Diameter 20 25 32 40 50 63 75 90 110 125 160 200 mm (Inner Diameter 25 mm)

The valve can be installed vertically or horizontally, (if you want to install it horizontally, you need to (1) make sure the normally closed state before installation, (2) the water outlet position is a little higher than the water inlet.)