None return Flapper valves come in four sizes, 1",1 1/2",2" and 3" ,,they fit straight onto c class pressure pipe commonly used in the koi industry,you can use a pressure to wast insert to take it down to solvent weld pipe.
- No Pressure on the pond pump
- Easy to fit with solvent weld glue
- Very strong PVC
- Split union ends easy to dismantle