Flush Mount Cap Only

The RCI Flush Mount Cap Only (model 7031A) is a replacement or upgrade filler cap designed for fuel cell systems requiring a 3-inch ID twist-on connection. This black plastic cap delivers a secure, flush-mounted profile that integrates seamlessly into vehicle fuel system installations, whether for street performance applications, motorsports, or auxiliary fuel tank setups. The circular filler plate design ensures consistent sealing and straightforward installation without protruding hardware.

Built with durable plastic construction, the 7031A cap withstands fuel contact and environmental exposure while maintaining a low-profile aesthetic. The 3-inch inner diameter accommodates standard fuel cell filler necks, and the twist-on mechanism provides quick-access refueling without complex fasteners. The flush-mount design minimizes intrusion into engine bays or cargo areas, making it ideal for custom fuel system configurations where space efficiency matters. RCI's engineering focuses on reliability and compatibility across diverse fuel cell applications.

This cap replacement is essential for fuel cell owners performing maintenance, upgrading older systems, or completing custom fuel tank installations. It serves racing teams, off-road builders, and street performance enthusiasts who demand functional, no-frills components. Whether restoring a fuel cell system or standardizing multiple tank setups, the RCI 7031A provides a proven solution backed by RCI's reputation in fuel cell and performance system components. Single-unit purchase allows for targeted replacement or test fitment before committing to larger quantities.