The PAI 2-1/4" neck radiator cap for Mack is designed to support efficient engine cooling by maintaining optimal radiator pressure. It provides a secure seal that minimizes coolant spillage, reducing the risk of coolant loss and maintaining consistent engine function. With a precision fit tailored specifically for Mack vehicles, it enhances compatibility and performance. The radiator cap also facilitates effective heat dissipation, contributing to prolonged engine life by ensuring consistent and efficient cooling performance.