Radiator Cap Large 22lb

The Radiator Cap Large 22lb from PWR NORTH AMERICA is a high-pressure cooling system component engineered for vehicles that demand reliable thermal management. As any experienced mechanic knows, the radiator cap does far more than seal the coolant reservoir—it regulates system pressure, raises the boiling point of coolant, and prevents cavitation that can damage water pumps and cylinder heads. The 22-pound rating on this cap makes it suitable for modern street and performance vehicles operating under sustained load, where maintaining precise coolant pressure is critical to engine longevity and efficiency.

This radiator cap features a steel construction with zinc oxide coating for corrosion resistance and durability in harsh underhood environments. The 32 mm neck diameter matches OEM and aftermarket radiators across a wide range of domestic and import platforms, ensuring proper fit and seal integrity. The 22-pound pressure rating means the cap opens at a higher threshold than standard 16-pound caps, allowing coolant to reach higher temperatures before boiling—essential when upgrading to performance heads, larger displacement engines, or installing high-output cooling systems. Steel construction resists deformation under thermal cycling, maintaining a consistent seal throughout the cap's service life.

Technicians and engine builders choose the Radiator Cap Large 22lb when rebuilding cooling systems on forced-induction platforms, LS-swapped vehicles, or any application where coolant stability matters. The round design provides straightforward installation on standard radiator necks without adapter requirements. Verify your radiator neck diameter and current system pressure rating before selection; upgrading to a 22-pound cap on a system designed for 16 pounds can stress hoses and gaskets, while undersizing reduces thermal margin on high-output engines. This cap is ideal for restoration projects, performance builds, and any situation where OEM caps have failed or pressure ratings no longer match evolved cooling demands.