O-ring for Water Neck Fitting

The O-ring for water neck fitting by ALLSTAR PERFORMANCE is an essential replacement seal designed for automotive cooling systems where the water neck connects to the radiator hose or intake manifold. This critical component prevents coolant leaks at a high-pressure junction point, maintaining system integrity and engine operating temperature. Whether you're performing routine maintenance, rebuilding an engine, or diagnosing a slow coolant leak, this precision rubber seal delivers reliable performance in the demanding environment of modern and classic engines alike.

Constructed from durable rubber, this O-ring features a 1.044-inch inside diameter and 1.315-inch outside diameter with a 0.13-inch cross-section thickness. These precise dimensions ensure proper compression and sealing force when installed on the water neck fitting, creating a watertight barrier without restricting coolant flow. The compact profile (2.15 x 0.45 x 4.05 inches) and lightweight design (0.02 lbs) make installation straightforward, while the material composition resists degradation from coolant additives and temperature fluctuations typical in automotive applications.

Technicians and engine builders rely on this O-ring for water neck fittings across stock rebuilds, performance upgrades, and restoration projects. It's sold as a single unit, allowing you to stock spares for multiple projects or vehicles. Installation requires no special tools—simply remove the old seal, clean the seating surface, and press the new O-ring into place. Compatible with most conventional cooling systems that use rubber seals at the water neck interface, this part represents an affordable way to prevent costly coolant loss and potential overheating.