Yantai sanmon mechinery equipment Co., Ltd is a leading petroleum machine parts supplier around the world. Found in 2010, professional on supplying all kinds of petroleum machine and kelly valves, square and hexagmonal kelly, drill collar, heavy weight drill pipe, drill pipe and parts like sucker rod, rod, polished rod, sinker bar, drive rod, sucker rod coupling, sub cupling, polished rod connection, stuffing box, sucker rod guide & certralizer, polished rod clamp, polished rod bop, pumping tee, sucker rod sub surface pump, pump barrel, pump plunger, pump coupling, seating cups, nipples, seals and other accessories.