One-Way Check Valve | Inline Non-Return Check Valve | 4mm 6mm 8mm Plastic

This plastic one-way check valve 12mm makes sure that liquids or gasses flow in only one direction. It's a simple inline valve that stops backflow in your lines. The valve opens when pressure pushes forward and closes by itself if the flow tries to go backward. Features and Benefits - Simple internal spring action - Works automatically based on flow direction, needing no power or manual control. - Barbed ends for 12mm ID hose - Grips flexible tubing tightly for a secure, leak-free fit when clamped. - Fuel and oil resistant plastic body - Safe to use in car fuel lines, fluid transfer pumps, and with other common liquids and gasses. - Clear plastic housing - Lets you see that fluid is flowing and that the valve is working right. Applications - Installing in a vehicle's fuel line to keep it ready and stop fuel from draining back to the tank. - Using with an aquarium air pump to prevent water from siphoning back into the pump if power goes out. - Adding to the outlet line of a small water pump to hold pressure and stop backflow when the pump is off.