The Flow Check Valve 40mm Waterco is a compact, serviceable safeguard for pool pumps and water systems, engineered to keep suction prime steady and prevent costly backflow. This 180° flow check valve is built to work across orientations and provide reliable protection where it’s most needed.
Key features that matter
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180° flow design — operates reliably whether your plumbing runs vertically, horizontally, or even upside down, removing orientation as a constraint.
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40mm pipe size with flexible fitting options — the 40mm pipe fits inside 50mm pipe; it can be glued inside 50mm fittings or fitted outside, giving install flexibility to suit existing plumbing.
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Serviceable by removing the cover — easy access for inspection, cleaning, or maintenance without replacing the entire valve.
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One size fits most installations — designed to simplify stocking and compatibility across common pool and water-system setups.
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On the suction side to protect the pump — helps prevent damage from loss of prime and unintended backflow, a critical safeguard for long suction runs or elevated installations.
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Reduces water loss and air-related issues — minimizes water loss from the hair and lint pot and allows air to bleed back through the filter/backwash valve, keeping the system primed.
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Ideal for elevated or long suction lines — especially important when the pump and filter are more than 600 mm above pool water level or the suction line is extended.
How it works
When the pump is running, the Flow Check Valve 40mm Waterco permits forward flow toward the pool or filtration system while preventing reverse flow. If the pump loses prime or a leak allows air into the suction line, the valve automatically resists backflow, helping maintain prime and reducing the risk of air getting drawn into the pump or traveling back through the backwash path.
Installation and compatibility
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Installation options — fits 40mm pipe, with compatibility for inside-glue installations into 50mm fittings or outside slip-fit connections on 50mm fittings.
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Orientation flexibility — can be installed in vertical, horizontal, or inverted positions to accommodate existing plumbing layouts.
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Practical placement — best placed on the suction side of the pump to maximize prime retention and protect the pump from air ingress and backflow-related issues.
Use cases and who benefits most
- Home swimming pools with long or elevated suction runs where prime loss is a concern
- Systems where the backwash valve or other connections may allow air to re-enter the suction line
- Installations needing a single, versatile valve that fits a 40mm pipe and works with 50mm fittings
- Pumps that benefit from a serviceable, maintainable check valve to simplify routine upkeep
With the Flow Check Valve 40mm Waterco, you gain a practical, durable solution that addresses prime loss, backflow prevention, and air management in one compact unit. It’s a targeted upgrade for pool systems and water setups where reliability, orientation flexibility, and easy maintenance matter most. Add it to your pool hardware lineup and enjoy steadier priming, fewer backflow issues, and smoother operation across varying installation configurations.
