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Yunsheng is the manufacturer offering API sucker rod coupling in Shandong China. All the rod coupling produced by API 11 B standard. These sucker rod coupling are very cost effective, including class SM sucker rod coupling, class T sucker rod coupling, Sub sucker rod coupling, Full Size coupling, Slim Hole coupling. They are available in 5/8��? 3/4��? 7/8��? 1��?and 1-1/8��? Manufactured with high quality Carbon steel AISI 5I40 /4135. If you have any interests on our sucker rod coupling, please feel fr...
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