Answer
Mar 23, 2026 - 09:09 AM
Black (4200-0004E): This is the EPDM (Ethylene Propylene Diene Monomer) diaphragm, commonly used for water, fertilizers, and some pesticides.
Green (4200-0004V): This is the Viton (FKM) diaphragm, which is typically used when higher chemical resistance is needed.
Blue: Generally indicates a specialized material (like BlueFlex) or, in the context of ProFlo check valves, can be associated with different spring pressures (e.g., 25 PSI).
Green (4200-0004V): This is the Viton (FKM) diaphragm, which is typically used when higher chemical resistance is needed.
Blue: Generally indicates a specialized material (like BlueFlex) or, in the context of ProFlo check valves, can be associated with different spring pressures (e.g., 25 PSI).
