... , etc 3.Different sizes are available Product NameNR Rubber O ringCertificateISO9001:2008Country of OriginChinaAdvantagea. Ozone and chemical resistanceb ... can provide you with many different sizes of rubber ring according to your drawing or samplesMatetialNBR, NR ... of valves and pipes, rubber seals, auto rubber parts, industry rubber parts, auto rubber parts, rubber roller used in the wrapping ...