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Treadstone Performance Engineering's high performance oil and water hose swivel fittings are cut from aircraft-grade 6061 T6 Aluminum on CNC turning machines. Designed with high tolerances to provide a snug fit to both the 304 SS or Nylon Braided PTFE Lines and the SAE 37° (JIC) female swivel it will connect to. Our swivel fittings provide superior strength with easy and fast assembly. High quality Viton o-rings provide a consistent and leak-free seal, even when used with racing fuels and oils. Lastly, our black anodizing adds a final touch of stealth and quality that our customers expect from Treadstone Performance. Integrated with a PTFE inner liner, these fittings are capable of withstanding highly corrosive environments caused by E85 or other Alcohol-based fuels. They are specifically designed for Treadstone's PTFE Hoses and have been tested under extreme conditions to ensure a leak-free system. Ideal for use in off-road racing