Double-ball Rubber Joints, made of NR, SBR, IIR, NBR, ... corrosion resistance, wear resistance, and oil resistance. Double-ball Rubber Joints, made from inside layer, enhanced layer ... layer plastic scratch nylon cord fabric, and outer rubber tubes. There are many raw materials, such as ... forbidden, and so on.1. Products Name: Double-ball Rubber Joints2. Applications: Piping system of excavators, Mobile ...