The u ring seal makes use of the advantages of Polyurethane, such as high strength, hardness, good elasticity and durability. It is used in the hydraulic testing of oil well casing tubes, steel pipes and a variety of welded steel pipes of the petroleum and natural gas industry. Product information The u ring seal makes use of the advantages of Polyurethane, such as high strength, hardness, good elasticity and durability, it has high sealing performance, abrasion resistance, and low deformation.It is used in the hydraulic testing of oil well casing tubes, steel pipes and a variety of welded steel pipes of the petroleum and natural gas industry.