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Description
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
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