SKU: ALL50822-50
UPC: 848238057164
MPN: ALL50822-50
The ALLSTAR PERFORMANCE -4 Aluminum Caps 50-pack (ALL50822-50) is an essential fastener solution for serious engine builders and performance mechanics working with AN fittings in high-flow fuel, coolant, and oil systems. These aluminum caps serve as protective port plugs and system terminators, preventing fluid leakage, contamination, and air infiltration in pressurized applications.
Manufactured from aircraft-grade aluminum, the -4 size accommodates standard -4 AN fittings (0.500" SAE port thread) commonly found in carburetor fuel bowls, block heater ports, thermostat housings, and transmission cooler lines. The aluminum construction offers significant weight savings compared to brass or steel alternatives—critical in competition builds targeting every fraction of a pound. Each cap threads cleanly without requiring PTFE tape, and the precision machining ensures a tight, vibration-resistant seal.
Performance enthusiasts restoring vintage muscle cars, building custom hot rods, or developing competition drag and road race vehicles will appreciate having a full 50-pack of these caps for multi-system builds or fleet applications. With their lightweight and corrosion-resistant properties, these caps are a reliable choice for any high-performance application.
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