... Rubber ball for valve 1.Certificate: ISO9001:2008 2.Material: NBR, NR, EPDM, etc 3.Different sizes Product NameRubber ball ... materials, advanced equipment, skillful workmanship, rigorous quality control standards,attractive design and durability. They are well- ... materials, advanced equipment, skillful workmanship, rigorous quality control standards,attractive design and durability. They are well- ...