AN Cap -4

The Allstar Performance AN Cap -4 is a precision aluminum fitting cap designed for high-performance fuel and fluid systems in modern street machines, race cars, and custom builds. This compact adapter serves as a critical interface in AN (Army Navy) plumbing setups, where system integrity and leak-free connections are essential. Whether you're routing fuel lines in a turbocharged engine bay, setting up a dry-sump system, or assembling a custom cooling loop, the -4 cap provides the reliable termination point every serious build requires.

Manufactured from lightweight 6061-T6 aluminum, the AN Cap -4 features precision-machined construction that ensures consistent thread engagement and zero-leak performance under pressure and vibration. The -4 designation indicates a 4 AN size, which is commonly used in various fuel and coolant applications. Allstar Performance's quality control guarantees tight tolerances and a corrosion-resistant anodized finish, critical when managing high-octane fuel or engine coolant that demands chemical compatibility and durability over thousands of heat cycles.

Mechanics and engine builders rely on the AN Cap -4 when capping off unused AN ports, preventing fuel weeping, system contamination, and air ingestion in pressurized circuits. This fitting is ideal for late-model LS swaps, carb-to-EFI conversions, nitrous systems, and any application where clean, professional plumbing is required. With its robust design and reliable performance, the AN Cap -4 is a must-have for any serious automotive enthusiast.