Radium 20-0534-06 6AN Universal Check Valve Kit for Fuel Oil Coolant Fluid Lines

Vehicle Fitment

• Universal - Compatible with any vehicle or fluid system using 6AN inline plumbing

Fitment Notes

• This is the 6AN variant of the Radium 20-0534 universal check valve body - all inlet and outlet ports are converted to 6AN male and/or 6AN female via included adapter fittings
• Native check valve body (20-0534) uses a 10AN male outlet and 8AN female inlet; adapter fittings in this kit convert both to 6AN
• All female AN ports accept both 37-degree flare male fittings and ORB (O-ring boss) male fittings
• Additional kit variants available: 20-0534-08 (8AN) and 20-0534-10 (10AN)

Features

• Spring-loaded piston design allows flow in one direction only, preventing backflow under all conditions
• Aerodynamic internal plunger geometry promotes smooth, laminar fluid flow with minimal restriction
• Flow direction laser-etched on the valve body for correct installation orientation
• FKM (Viton) body and plunger seals provide excellent resistance to fuel, oil, coolant, and chemical fluids
• Stainless steel spring, plunger, and hardware for corrosion resistance and long-term durability
• Lightweight anodized aluminum body rated to 1000+ psi max operating and backflow holding pressure
• Compatible with gasoline, ethanol, methanol, diesel, water, coolant, oil, and more

Specifications

• AN Size: 6AN (inlet and outlet)
• Check Valve Type: Spring-Loaded Piston
• Body Material: Anodized Aluminum
• Seal Material: FKM (Viton) - body and plunger
• Hardware / Spring / Plunger: Stainless Steel
• Large Hex: 30mm (1-3/16")
• Length (without adapters): 1.72" (43.6mm)
• Cracking Pressure: 0.3 psi @ 70°F
• Max Operating Pressure: 1000+ psi @ 70°F
• Backflow Holding Pressure: 1000+ psi @ 70°F
• Application: Universal - fuel, oil, coolant, water, and chemical fluid systems

Included Components

• 1x Radium 20-0534 universal check valve body
• 1x Set of 6AN adapter fittings (inlet and outlet conversion)

Product Description

The Radium Engineering 20-0534-06 is the 6AN variant of Radium's universal inline check valve kit. It allows fluid to flow in one direction only, making it ideal for use in fuel surge tank return lines, pump outlet circuits, coolant systems, oil lines, and any application where backflow prevention is required. The included 6AN adapter fittings convert both the inlet and outlet of the base 20-0534 valve body to 6AN connections, supporting both 37-degree flare and ORB male fittings.

Built from anodized aluminum with FKM seals and stainless steel internals, this check valve is rated to over 1,000 psi of backflow holding pressure and opens at just 0.3 psi - ensuring it stays out of the way during normal flow while providing absolute protection against reverse flow. Compatible with virtually all automotive fluids including gasoline, E85, methanol, diesel, coolant, water, and oil, it suits a wide range of motorsport and high-performance build applications.