Vacuum Pump Reseal Kit for Cummins Wabco Vacuum Pumps. This fits Ram Cummins Diesels from 1991.5-2002. Main shaft seal is Viton for superior sealing and high temperature durability. Our main shaft seal is also double lipped. If your pump is leaking, our seal will move the sealing surface from the original groove to 2 areas on either side of this worn in groove. Seal is also spring loaded to hug the spinning steering shaft with proper tension. We provide the parts you need to reseal the vacuum pump successfully. For a completely leak free installation, we suggest a bead of RTV silicone between the vacuum pump and your timing case (instead of a gasket). Instructions are not included but procedure is simple and highlighted in multiple YouTube videos. The hardest part is removal of the pump itself.