rubber o-ring Material:EPDM Owns the patent of rubber cap. we can design the products for customers' specail need. rubber o-ring: 1.Material :epdm(import from Holland company:DSM or Janpanese company) 2. Specifications of rubber cap,rubber gasket,O-ring,can desiged and satified for customerss special requirement. 3. Optional colors of rubber cap,rubber gasket,O-ring,can make it on your order. 4. ...