The rubber seals, the high elongation cast ductile iron clamp and the high strength connecting bolts of Tongjiang brand connection are all manufactured in accordance with GB5135.11-2006. Each batch of products are tested by chemical and mechanical propert
The rubber seals, the high elongation cast ductile iron clamp and the high strength connecting bolts of Tongjiang brand connection are all manufactured in accordance with GB5135.11-2006. Each batch of products are tested by chemical and mechanical propert
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