The FCS Fusion Plug – 9° is a genuine FCS Fusion fin box designed for surfboard manufacturing and professional surfboard repairs. Featuring a built-in 9-degree cant, this plug is intended for rail fin positions on high-performance surfboards that require increased fin cant for responsive turning and maneuverability. The Fusion system is installed before lamination, allowing fiberglass to laminate directly over the flange for exceptional strength and long-term durability. Its integrated high-density foam base creates a strong bond with the surfboard blank while reducing the chance of movement or cracking under load. FCS Fusion plugs are compatible with original dual-tab FCS fins and remain a trusted choice among professional surfboard builders for both new board construction and repairs. Features Genuine FCS Fusion fin plug Built-in 9° cant for rail fin positions Pre-lamination installation system High-strength composite construction High-density foam foundation for added durability Compatible with original dual-tab FCS fins Ideal for surfboard manufacturing and professional repairs