Piston and Cylinder Kit is the repair set we use to rebuild the heart of the breaker hammer. It has the piston, cylinder sleeve and seals that wear out from all the pounding. We disassemble the breaker, remove the old piston and tube, and swap in the new kit parts. The new piston slides perfectly in the new cylinder, so oil power converts to hammer strikes without leaks. We follow service steps, tighten bolts to specs and grease seals. It gives our hammer back its original punch, no compromise.