Grease nipple use corrosion resistant materials(or hard alloy),and it can resist high pressure high speed liquid scouring.The grease nipple and valve body is connected by thread.With exclusive dismantling tools to disassemble grease nipple conveniently.The connection between seal head and valve body is union,which is simple and accessible.By changing different specifications of the grease nipple,choke dia. can be changed and flow canb e controlled.