... OIL DRILLING STABILIZERS, SUCKER ROD COUPLING PROFESSIONAL MANUFACTURER API 11B STANDARD ... couplings, including Spray Metal coupling, class T coupling, Altra High Strength,Sub OD coupling, with various spec. of ... in China.PRODUCT BRIEFThe SPRAY METAL sucker rod coupling is processed with some special technology, coated ... and slowing down the wear. The coupling has many types and sizes, and it is made of ...