PU Hydraulic Seal is made from polyurethane (PU) material. They are used in hydraulic systems to prevent hydraulic fluid from leaking past moving parts, such as pistons, rods, and valves. PU hydraulic seals are known for their durability, high abrasion resistance, and good performance in high-pressure and high-temperature applications. There are several types of PU hydraulic seals, including piston seals, rod seals, wiper seals, and static seals.