Earl's Performance In-Line Check Valves

Earl's Performance In-Line Check Valves are precision-engineered one-way flow control valves built to deliver dependable, long-lasting performance across modern automotive fuel, oil, brake vacuum, and fluid systems. Developed as a direct evolution of the classic surplus check valve design, Earl's redesigned these valves from the ground up using contemporary materials that eliminate the well-known compatibility limitations of older surplus units.

Traditional surplus check valves served fuel systems for decades, but their original synthetic rubber seals are not always compatible with today's fuel blends and additives. Earl's addressed this directly by replacing outdated seal materials with modern elastomers engineered to resist degradation across the full spectrum of current fuel types — including gasoline, diesel, methanol, and ethanol-blended fuels.

Key Features:

• Modern Elastomer Seals — Engineered to resist breakdown from today's fuel blends, additives, and automotive lubricants, solving the compatibility issues found in legacy surplus valves
• Viton® Seal Technology — Select models feature reinforced Viton® seals with aluminum support for superior chemical resistance and extended service life
• GF-600S Viton® UltraPro Models — Premium UltraPro variants use GF-600S Viton®, the highest-grade seal material available, delivering outstanding performance with all fuel types including diesel and alcohol-based fuels
• Stainless Steel Hinge Construction — UltraPro series features an internal stainless steel hinge for proven durability in a compact, lightweight package
• Military-Proven Design — UltraPro models are based on a proven military design that delivers a more compact profile than conventional flapper check valves
• Precision-Machined Aluminum Body — Lightweight anodized aluminum construction withstands the thermal and chemical demands of high-performance applications
• Reliable One-Way Flow Control — Maintains proper system pressure and prevents backflow to protect downstream components
• Broad Application Range — Suitable for fuel delivery systems, oil lines, brake vacuum lines, and general fluid control plumbing
• Emissions Compliant — Legal for use on emissions-controlled, non-emissions-controlled, and racing-use-only vehicles

Available in multiple AN fitting sizes and configurations, Earl's Performance In-Line Check Valves are the trusted choice for enthusiasts and professional builders who demand proven, chemically compatible, long-term reliability from every component in their fluid system plumbing.