Our Piston with Replacement Rubber includes two types: Single-Active and Double-Active. Material of the Piston Hub is 40Cr forging steeland the surface of the hub could be phosphorated or oiled according to clients’ requirement. Piston Rubber is made of premium synthetic rubber and rubber with fabric so that the service life is the same with the similar products aboard. Our products conform to the standard of API and performance excellent in every drilling condition. Our Piston Hubs are made of premium forging steel, Piston Rubber is made of NBR which is proof against heat, oil, water. The backing of Piston Hubs is made of layers fabric, which is high tensile strength resistant, chemical resistant, wear resistant, long service life.