The piston core is forged from high-strength 40Cr steel, while the piston rubber is made from specially formulated nitrile rubber, offering excellent resistance to heat, oil, and water. The root of the piston is reinforced with cloth-insulated rubber to enhance tensile strength and wear resistance, resulting in a long service life. The assembled rubber piston is available in both single-acting and double-acting types, utilizing high-quality synthetic rubber that delivers performance comparable to similar international products. Its dimensions conform to API standards and are fully interchangeable with original parts.