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- Plumbing Valves - 1/2" F x F Non Return Valve
Plumbing Valves - F x F Non Return Valve. Non-return valves are used to acquire a one directional flow of liquid and is beneficial in regulating a heating system. The advantages of nonreturn valves in a heating system are: Protects the system from mains supply pressure surges. Protects the water supply main from back siphoning.