MAT - EDI

Old Part Numbers: 165-0304Overhaul kit for the HB55 in-line 2-stage air compressor pump, includes valve plate assembly with valves, gasket set, piston ring set, conrod insert bearings, oil seal, and...

Head Gasket only. We always recommend replacing all head gaskets at the same time, as the other gaskets can be compromised once the head is removed. Note: We recommend you replace the Cylinder Gasket...

  (A.O. Smith) Unit bogging down? Replace this if no continuity.If needle drops to zero and slowly rises, it is probably good.