Earl's Performance AN 901 Copper Crush Washers

Earl's Performance AN 901 Copper Crush Washers are precision-engineered sealing components designed for use with straight-threaded AN adapter fittings in ports that do not feature an O-ring relief groove. Available in a broad range of AN and metric sizes, this product line delivers consistent, leak-free performance across high-performance automotive, racing, marine, and industrial fluid system applications.

Key Features:

• High-quality copper construction provides excellent compressibility, corrosion resistance, and long-lasting sealing performance
• Crush-seal design creates a positive metal-to-metal seal when torqued to specification, eliminating fluid weepage at the port
• Straight-thread compatible — engineered specifically for AN straight-thread fittings, not tapered pipe thread (NPT) applications
• Broad fluid compatibility — suitable for use with oil, fuel, brake fluid, and common automotive and hydraulic fluids
• Available in convenient multi-packs for workshop and professional use
• Single-use design ensures maximum sealing integrity at every installation
• Legal for use on emissions-controlled vehicles, non-emissions-controlled vehicles, and race-only vehicles

Installation Notes:

• For use with straight-thread AN fittings only — not compatible with tapered NPT pipe threads
• Replace with a new washer each time a fitting is removed and reinstalled
• Ensure mating surfaces are clean and free of debris before installation
• Torque to manufacturer specifications for proper crush and seal formation

About Earl's Performance:

Earl's Performance Plumbing has been bringing aviation-grade fluid transfer technology to the automotive performance market for over five decades, offering one of the most comprehensive lines of performance plumbing products available. The AN 901 Copper Crush Washer line is a trusted solution for brake systems, fuel lines, oil circuits, and hydraulic assemblies where a reliable, leak-free connection is critical to safety and performance.