O-Ring Kit

The CSR Performance O-Ring Kit (911-912KIT) is a precision rubber seal assembly designed for water neck applications on cooling systems. This O-ring kit serves as a direct replacement for OEM seals that degrade over time due to coolant exposure, temperature cycling, and mechanical stress. Compact and lightweight at just 0.02 lbs, the kit delivers critical functionality in maintaining a leak-free seal at the engine block water neck junction—an essential maintenance component for engine longevity and cooling system efficiency.

CSR Performance's O-ring design accounts for the high-pressure, high-temperature environment of modern cooling systems. The rubber composition resists degradation from coolant chemistry and thermal cycling, preventing coolant seepage that can compromise engine bay integrity. The kit's compact footprint (3.95 × 0.3 × 6.85 inches) includes all necessary seals for complete water neck assembly work, eliminating the need to source individual components from multiple vendors. Installation is straightforward during routine cooling system maintenance or water neck replacement procedures.

This O-ring kit is ideal for automotive technicians, engine builders, and enthusiasts performing water neck replacement or cooling system service on vehicles equipped with CSR Performance water necks. Whether addressing a known coolant leak or performing preventive maintenance, this kit eliminates guesswork by providing factory-correct seals in a single package. The kit's affordability and compact storage make it a practical addition to any shop's cooling system repair inventory.

O-ring degradation is a common cause of slow coolant leaks that can go unnoticed until significant damage occurs. By maintaining a stock of verified OEM-equivalent seals, technicians can address water neck issues promptly and ensure vehicles return to service with reliable cooling system performance.