... .Anti-sand 3.wear-resisting property 4.hard chromium plated Long Plunger Anti-sand PumpStandardThe executive standard of the products is ... Application The pump adopts the structure of short pump barrel, long plunger , sinking sand under the pump and oil-taking laterally ... prevention clip, sand prevention cover, wear-resisting, anti-corrosion and long service life. It is suitable for the oil well with ...