HNA can offer bonded urethane piston and pistons with replacement rubbers, and the latter ones include single action and double action.

Pistons with replacement rubbers:

This piston includs:piston hub.snap ring, piston rubber and plate. The rubber can be changed when it's broken.The piston hub is made of 40Cr.The plate is made of 45# steel. And the snap ring is made of 65Mn.

Bonded construction - no joints, no leakage. Longer piston and liner life. This piston will run in higher-pressure, fast stroking pumps, and is resistant to oil base muds and other additives currently being used. This Premium Piston has been in service for years, providing unmatched performance under extreme drilling conditions. This one piece bonded unit provides the same series of advantages, being impervious to oil and other chemicals.