Recirculation valve
Access to the recirculation valve diaphragm is provided through the lower opening of the valve.
1. Check the diaphragm movement by pressing with your finger. The diaphragm should fully enter the valve body with a slight force.
2. If in doubt, compare the diaphragm stroke of the old and new valves.
3. If resistance to movement of the diaphragm is felt, replace the valve.