


Radium FCST Filler Adapter, 6-Bolt to 3-Bolt
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Description
Radium FCST Filler Adapter, 6-Bolt to 3-Bolt
Application: Legacy Radium FCST with a 6-bolt fuel filler flange, using current 3-bolt FCST-X filler necks
Part Type: FCST filler adapter (3-bolt filler to 6-bolt FCST)
Part Number: 20-1127
This Radium Engineering adapter lets any current 3-bolt FCST-X fuel cell filler neck be fitted to a legacy FCST that uses the 6-bolt filler hole pattern. It adds less than 12.7mm (1/2in) of height to the filler cap or neck once installed.
To keep the same safety measures as previous models, roll-over protection is built in using the same one-way valve as legacy FCST fillers, and a new gasket is included.
Key Features
- Adapts: 3-bolt FCST-X filler necks onto a 6-bolt FCST flange
- Low Profile: Adds less than 12.7mm (1/2in) of height
- Roll-over Protection: Built-in one-way valve, as used on legacy FCST fillers
- Construction: Anodised aluminium with stainless steel hardware
What's Included
- Anodised aluminium adapter
- Roll-over valve
- 6-bolt gasket
- Stainless steel hardware
Optional Parts
- Radium Engineering FCST-X 3-Bolt Direct Mount Fill Neck and Cap - Vented (20-1197-V) – direct mount vented fill neck and cap
- Radium Engineering FCST-X 3-Bolt Remote Mount Fill Neck - Straight with 1.5" Barb (20-1027) – straight 1.5in barb remote fill neck
- Radium Engineering FCST-X 3-Bolt Remote Mount Fill Neck - 24AN Elbow with 1.5" Barb (20-1047) – 24AN 75° elbow remote fill neck
Important Notes
- The 3-bolt side O-ring and mounting hardware come with the filler neck, not with this adapter
- Sealing washers are only needed on older 20-014X-XX FCSTs (per Radium's instructions)
- Installation instructions are available in the Instructions tab
Vehicle Fitment
- Radium FCST (legacy 6-bolt filler flange)
Not sure if this suits your vehicle? Email sales@coore.com.au and our team will confirm fitment.

