The Radium SVF swing valve filler cap is a capless filler designed to screw into Radium's 'silver cup' fuel filler receptacles. Modeled after OEM capless fillers, it uses a spring-loaded door with an O-ring to stay closed when not in use and includes an optional dust cap with tether. This cap is not compatible with Radium Dry-Break fuel fillers.
Radium Engineering Remote Mount SVF Swing Valve Filler Cap