This kit includes gaskets, piston, seat, valves, plunger, springs, saddle and guides to repair an air compressor Mount Type: Two-Piece - Symmetric Head Outside Diameter (mm): 114 Head Outside Diameter (in): 4.49 Head Thickness (mm): 21 Head Thickness (in): 0.83 Pilot Outside Diameter (mm): 90 Pilot Outside Diameter (in): 3.54 Inside Diameter (mm): 28 Inside Diameter (in): 1.1 Mount Height (mm): 43 Mount Height (in): 1.69 Bonded Sleeve: Yes Standard Bolt Size: M24