... 2.fatigue resistance 3.high-press resistance compressor oil seal for sd507(8353)/sd508(8390) Brand Name :GR place of Origin ... spring (spring stainless steel is widely used in mechanical seals, rotary joints, aviation, aerospace, petroleum, chemical industry, printing and dyeing, steel ... Asia, South America, Europe and Africa, etc. compressor oil seal for sd507(8353)/sd508(8390)