One Way Check Valve None Return Many Sizes Available

One-Way Alloy Fuel Non-Return Check Valve

This high-quality alloy one-way check valve is designed to maintain consistent fuel pressure, improve hot starts, reduce priming time, and prevent reverse flow in fuel, water, or oil systems. Ideal for performance cars, carb setups, diesel systems, marine applications, caravans, RVs, and general machinery. Great for water pressure pumps and galley pumps which are not self priming. 

Why Use a Check Valve?

In fuel systems, a non-return valve helps:

• Hold fuel rail pressure after shutdown

• Reduce fuel pump priming time

• Improve hot starts by preventing fuel vaporisation in the rail

• Lower evaporative emissions

• Keep the fuel line full by stopping drain-back to the tank

Perfect for carbureted engines, diesel systems, and any setup where consistent line pressure is critical.

Compatible Fluids

✔ Petrol / Gasoline
✔ Diesel
✔ Water
✔ Oils
✔ General automotive & industrial fluids
❌ Not suitable for methanol — will damage internal seals.

Applications

• Automotive fuel systems

• Carbureted engines

• Diesel engines

• Marine / outboard motors

• Salt-water pumps

• Water pressure & galley pumps

• RV / Caravan systems

• Agricultural machinery

Features

• Lightweight alloy body

• Arrow marking showing correct flow direction

• Prevents fuel or fluid from returning to the tank

• Helps maintain consistent pressure in both automotive and industrial systems

• Works with EFI, carb, diesel and water systems (non-methanol)

Working Pressure

0.2 – 6 Bar (0.30 – 87 PSI)

Sizes Available

• 6mm (1/4")

• 8mm (5/16")

• 10mm (3/8")

• 12mm (1/2")