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12mm Inline Check Valve: A plastic one-way non-return valve with 12mm (1/2 inch) barbed hose connections. Opening pressure is above 0.015 MPa. The valve body is white plastic with a ridged outer ring for a secure grip in the line. Stops Reverse Flow: The valve lets liquid or air flow in one direction only and blocks return flow, helping to stop fuel draining back to the tank and keeping the line full between uses. Arrow Marks the Flow Direction: A moulded arrow on the valve body shows the direction of flow, making installation straightforward when fitting into a hose or pipe run. Works with Common Fluids: Suitable for water, petrol, oils and air in low-pressure lines such as garden watering, boat tanks, pumps, air lines and similar DIY setups. Check Before Fitting: Confirm your hose inner diameter and fluid compatibility before ordering, as fittings can vary between 12mm barb sizes. Each pack contains one check valve.