Radium Direct Mount Fill Neck and Cap — Vented
The Radium Engineering 20-0197-V Direct Mount Fill Neck and Cap is designed for filling directly into a fuel cell, providing a clean and simple fuelling solution for any cell using a 6-bolt, 2.18" (55mm) bolt circle mounting flange — the standard pattern used on all Radium Engineering Fuel Cell Surge Tanks. Screw threads are the industry-standard 1/4"-28.
This kit uses the 20-0148-V vented fill neck cap (included) for quick and simple filling. The vented design allows air to escape during filling, preventing pressure build-up in the cell. All sealing is handled by Viton gaskets and O-rings for full E85 and fuel compatibility.
Suits: Any fuel cell with a 6-bolt, 2.18" (55mm) bolt circle mounting flange — including all Radium Engineering Fuel Cell Surge Tanks
Kit Includes:
- 1x Machined and anodized aluminium fill neck
- 1x Anodized and laser-etched aluminium cap (20-0148-V, vented)
- 1x Viton gasket flange seal
- 1x Viton O-ring cap seal
- Stainless steel hardware
Specifications:
- Mounting flange: 6-bolt, 2.18" (55mm) bolt circle
- Thread standard: 1/4"-28
- Cap type: Vented (20-0148-V)
- Sealing: Viton gasket and O-ring
- Finish: Machined anodized aluminium, laser-etched cap
Available Part Numbers:
- 20-0197-V — Direct Mount Fill Neck and Cap, Vented
Why Radium Engineering?
- ✅ Manufactured in the USA to motorsport-grade tolerances
- ✅ Machined anodized aluminium with laser-etched cap and Viton sealing for long-term durability
- ✅ Trusted by tuners and race teams running high-power fuel cell builds worldwide
- ✅ Vented cap design prevents pressure build-up during filling for fast, safe fuelling
- ✅ Compatible with E85, ethanol, methanol, pump petrol, and flex fuel sensor integration
