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The Peterbilt Woodruff Key
Designed with high-efficiency media
leak-proof seal between the water pump and engine housing
it safeguards wiring and components from overloads and short circuits by promptly interrupting electrical flow when necessary
PETERBILT FILTER - AIR MID LIFE UPDATE Missing image The Peterbilt Woodruff KeyEnsure peak engine performance and protection with the Peterbilt Mid Life Update Air Filter (D37 1061). Designed for newer generation Peterbilt trucks, this high efficiency filter delivers superior airflow and contaminant capture to extend engine life and improve fuel economy. Built to OEM specifications, its a direct fit replacement that supports optimal combustion and consistent performance in demanding driving conditions. Whether you're upgrading