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- Plumbing Valves -3/4" C x C Non Return valve
Plumbing Valves - C x C 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 non return valves in a heating system are: Protects the system from mains supply pressure surges. Protects the water supply main from back siphoning.