... 3)Watertight or oiltight hollow rubber seal. 4)Available in Various About products:1.Material:EPDM,CR.2.Application:Mainly ... . About our company: Jiangyin Dingyan Seals Co.Ltd specializes in manufacturing engineering rubber products,marine hatch cover rubber packing (sponge ... and bridge shock absorption etc.These products are widely used in subway,shipping,dock,railway,machinery,bridge and other areas. ...