22850798
Cap
Mack

This cap provides a protective closure for a selected component in a Mack truck’s fluid or cooling system. Its design focuses on a secure seal, resistance to pressure, and compatibility with standard piping or reservoir interfaces. By preventing contamination ingress and evaporative loss, the cap helps maintain fluid quality and system pressure, supporting reliable operation across varying temperatures and duty cycles. Replacement is straightforward with minimal tools, and matching the correct cap size and thread type is essential for a proper seal. Routine checks during service help ensure the cap remains intact and functional. Source One Parts Center.