... COUPLING BRIEF7/8" SPRAY METAL SUCKER ROD COUPLING;API 11B APROVAL MANUFACTUER(11B-0088)HAVE GOODS IN STOCK,FULL SIZE, SLIM HOLE ... ., Ltd, founded in 1997, is a professional manufacturer of API 11B sucker rod couplings, including Spray Metal coupling, class T coupling ... in area and USD1.5 million planing to produce API 11B sucker rod. We are API 11B certificate approval company,Golden supplier of ...