The Baldwin RS3750 Air Filter protects your engine from airborne dirt and contaminants. Heavy-Duty Radial Seal Gasket and End Cap will not degrade under temperature extremes, changes in restriction or vibration ---Flexible Outer Edges makes for easy installation and removal in housings with minimal clearance ---PermaPleat Construction provides even pleat spacing to prevent bunching and prolong element life ---Spiral Glue Binding provides added pleat stability for peak media effectiveness Application Summary: Peterbilt, Kenworth Trucks Cross Reference: Donaldson P542101.