Profile: Yantai Yunsheng Petroleum Machine Accessory Co., Ltd. is a manufacturer of petroleum machinery accessories such as sucker rod, polished rod, polished rod clamp, and coupling. Our couplings include spraying welded coupling and reducing coupling. Anti-partial wear joint of two-way protective sucker rod is substantially better than common joint in terms of its anti-wear, anti-corrosion, and anti-friction functions. The oil well installed with anti-partial wear joint of two-way protective sucker rod can effectively reduce ground power consumption and prevent accidents, thus greatly improving its production, time efficiency, and utilization rate.