API 11B SUCKER ROD COUPLING; 11B-0088,MANUFACTURER, HAVE STOCKS FOR 3/4", 7/8",AND ... Co., Ltd, founded in 1997, is a professional manufacturer of API 11B sucker rod couplings, including Spray Metal coupling, class T coupling, Sub OD ... in area and USD1.5 million planing to produce API 11B sucker rod. We are API 11B certificate approval company,Golden supplier of Alibaba.com and ...