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A -4 AN anodized aluminum quick disconnect for fuel, oil and coolant lines. Both halves are clean dry-breaks, so the line does not spill when you uncouple it, which makes engine, tank and cooler changes faster and cleaner.
The O-ring seals are fluorocarbon (often sold as Viton), which resists fuels, oils and mineral greases and handles heat up to about 400 °F (200 °C). It has a 7/16-20 male AN4 thread on each side, a knurled collar on the female half for grip, and comes with -4 AN plastic caps to protect the threads. Sold individually.
It uses the same -5 disconnect body as the -6 AN version, QDSPH0506AL-F, so you can keep one disconnect style across different line sizes on the car.
