Radium O-Ring Service Kit, Standard FST

Radium O-Ring Service Kit — Standard FST (4" OD)

This is a genuine Radium Engineering O-ring service kit for the standard 4" OD fuel surge tank range, compatible with both new and old style FST and FST-R units. An essential maintenance item for any build running a Radium fuel surge tank — recommended to have on hand for scheduled servicing, rebuild, or any time the FST lid is removed and reinstalled.

Suits: Radium Engineering standard (4" OD) fuel surge tanks — FST and FST-R (new and old style)

Kit Includes:

• 16x Small O-rings for M5 bolts
• 2x Large O-rings for older style FST
• 2x Gaskets for newer style FST

Available Part Numbers:

• 20-0087 — O-Ring Service Kit, Standard FST (4" OD) — FST and FST-R compatible

Why Radium Engineering?

• ✅ Manufactured in the USA to motorsport-grade tolerances
• ✅ Genuine Radium replacement O-rings and gaskets for a leak-free FST seal
• ✅ Trusted by tuners and race teams running high-power fuel surge tank builds worldwide
• ✅ Compatible with both old and new style standard FST and FST-R units
• ✅ Compatible with E85, ethanol, methanol, pump petrol, and flex fuel applications