Replacement O-Ring 9in Dia

The Replacement O-Ring 9in Dia (Peterson Fluid MPN 08-0112) is a critical seal component engineered for oil tank systems requiring reliable fluid containment. This 9-inch outer diameter o-ring is designed specifically for Peterson Fluid oil tanks and similar reservoir applications where consistent pressure sealing is essential. Whether you're performing routine maintenance, replacing a worn seal, or servicing an existing system, this replacement o-ring restores the integrity of your tank assembly and prevents costly fluid leaks.

Manufactured from durable elastomeric rubber, this o-ring is formulated to withstand thermal cycling and prolonged exposure to petroleum-based fluids common in automotive and industrial hydraulic systems. The 9-inch diameter specification ensures a precise fit within Peterson oil tanks, creating a dependable barrier that maintains system pressure and prevents contamination. Rubber o-rings of this size are rated for typical oil tank pressures and temperature ranges found in street and racing applications, offering years of service when properly installed. The compact 0.3-inch cross-section reflects the engineered balance between sealing efficiency and installation accessibility.

Technicians and engine builders working with Peterson Fluid oil tanks—particularly those in high-performance, classic, or competition vehicles—benefit from having quality replacement seals on hand. Installation is straightforward: the o-ring seats in the tank's groove, ensuring a metal-to-rubber contact that prevents leakage during operation. Verify compatibility with your specific tank model and apply a light coat of the appropriate fluid to the o-ring before installation to ease seating and extend seal life. This individual replacement unit (each) allows targeted repair without purchasing an entire tank assembly.