#4 Flare Cap

The #4 Flare Cap is a precision hydraulic and pneumatic fitting cap manufactured by FRAGOLA for AN/JIC flare connection systems. This aluminum component is essential for technicians, fabricators, and system builders working with high-pressure fluid lines in automotive, aerospace, and industrial applications. The flare cap seals open 4 AN ports, protecting internal components from contamination while preventing fluid loss during assembly, testing, or maintenance downtime.

Constructed from lightweight aluminum and finished in blue anodized coating, this cap resists corrosion and oxidation in demanding shop and field environments. The blue anodize also provides visual identification within standardized color-coded fluid system labeling conventions—critical for safety and compliance in complex multi-circuit systems. The flare design ensures a leak-tight seal when threaded onto AN-compatible ports, maintaining system integrity without requiring sealant tape or additional hardware.

This cap is ideal for builders assembling custom brake lines, fuel systems, and coolant circuits in race cars, hot rods, and performance trucks where reliability is non-negotiable. Installation is straightforward—simply thread the cap hand-tight onto any open 4 AN female flare port. FRAGOLA's reputation for precision threading and consistent fit means no stripped ports or cross-threading concerns. Stock one in your workshop for emergency line sealing or keep several on hand during system fabrication and testing phases.