O-Ring Seal 3878987 Parts Number 3878987 Parts Name O-Ring Seal 3878987 Brand Cummins Cummins Models G28, V28 Related Posts Tappet 3931623 Retaining Ring 70183 Rocker Lever Housing Gasket 4899231 Rocker Lever 3053478 Cam Follower Roller Pin 4009248