-4 Aluminum Caps 50pk

The ALLSTAR PERFORMANCE -4 Aluminum Caps 50-pack (ALL50822-50) provides essential protection for AN-4 threaded hydraulic and fuel line fittings. These aluminum dust caps seal unused AN-4 ports during assembly, testing, storage, and transportation, preventing contamination and moisture ingress that can compromise system integrity. Available in a convenient 50-piece set, this product is a cost-effective bulk solution for shops, fabrication facilities, and serious enthusiasts who work with multiple systems or perform frequent maintenance cycles.

AN-4 (1/4-inch) connections are common in performance fuel systems, coolant loops, and brake lines across automotive, motorsports, and aviation applications. The natural aluminum finish resists corrosion under typical shop and engine bay conditions, while the threaded design ensures a secure, gas-tight seal that won't vibrate loose under operating conditions or rough handling. The compact form factor—measuring 3.95 x 1.05 x 6.05 inches for the entire pack—makes storage and inventory management straightforward for facilities managing multiple cap sizes.

This 50-pack is ideal for professional mechanics, race teams, custom fabricators, and engine builders who cannot afford downtime from contaminated fittings or cross-threading damaged caps. Whether protecting freshly installed lines during dyno testing, isolating unused ports in modular fuel systems, or maintaining a comprehensive spares kit, having fifty caps on hand eliminates the need for frequent reorders. The aluminum construction strikes a balance between durability and weight, making these caps suitable for both stationary shop work and mobile service applications.