... cover: 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 ( ... bridge shock absorption etc.These products are widely used in subway,shipping,dock,railway,machinery,bridge and other areas. ...