Radium Universal Check Valve

The Radium Engineering Universal Check Valve is a 1-way valve that permits flow in one direction only. Featuring a lightweight anodised aluminium body, FKM Viton seals, stainless steel hardware, and an aerodynamically shaped internal plunger for smooth laminar flow, this check valve is suitable for a wide range of motorsport and performance applications.

All female AN ports accept 37-degree flare male fittings and/or ORB (O-ring Boss) male fittings. Flow direction is laser etched on the side of the body. Compatible with gasoline, ethanol, methanol, diesel, water, coolant, oil, and more.

Variant Selection Guide

20-0534 — Check Valve Only

• Native form without adapter fittings
• 10AN male outlet / 8AN female inlet
• Ideal for custom plumbing setups where specific adapters are already on hand

20-0534-06 — 6AN Kit

• Includes the 20-0534 check valve body plus all necessary adapter fittings
• Converts both inlet and outlet to 6AN male and/or 6AN female

20-0534-08 — 8AN Kit

• Includes the 20-0534 check valve body plus all necessary adapter fittings
• Converts both inlet and outlet to 8AN male and/or 8AN female

20-0534-10 — 10AN Kit

• Includes the 20-0534 check valve body plus all necessary adapter fittings
• Converts both inlet and outlet to 10AN male and/or 10AN female

Specifications

• Check Valve Type: Spring-loaded piston
• Body Material: Anodised aluminium
• Plunger Material: Stainless steel
• Spring Material: Stainless steel
• Hardware: Stainless steel
• Body Seal: FKM Viton
• Plunger Seal: FKM Viton
• Large Hex: 30mm (1-3/16")
• Length (no adapters): 1.72" (43.6mm)
• Cracking Pressure: 0.3 PSI @ 70°F
• Max Operating Pressure: 1,000+ PSI @ 70°F
• Backflow Holding Pressure: 1,000+ PSI @ 70°F

Available Part Numbers

• 20-0534 — Radium Universal Check Valve (Check Valve Only)
• 20-0534-06 — Radium Universal Check Valve Kit, 6AN
• 20-0534-08 — Radium Universal Check Valve Kit, 8AN
• 20-0534-10 — Radium Universal Check Valve Kit, 10AN

Why Radium Engineering?

• ✅ Manufactured in the USA to motorsport-grade tolerances
• ✅ CNC-machined billet aluminium components built for performance and longevity
• ✅ Trusted by high-power build tuners and race teams worldwide
• ✅ Bolt-on fitment — no cutting, drilling, or fabrication required
• ✅ FKM Viton sealing — compatible with E85, methanol, oil, coolant, and all exotic fluid types