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Sincerely Your, SURF3DMORE INFORMATION ABOUT 3D MODELS :HAND PUMPS ARE MANUALLY OPERATED PUMPS; THEY USE HUMAN POWER AND MECHANICAL ADVANTAGE (SE HOL) TO MOVE FLUIDS OR AIR FROM ONE PLACE TO ANOTHER. THEY ARE WIDELY USED IN EVERY COUNTRY IN THE WORLD FOR A VARIETY OF INDUSTRIAL, MARINE, IRRIGATION AND LEISURE ACTIVITIES. THERE ARE MANY DIFFERENT TYPES OF HAND PUMP AVAILABLE, MAINLY OPERATING ON A PISTON, DIAPHRAGM OR ROTARY VANE PRINCIPLE WITH A CHECK VALVE ON THE ENTRY AND EXIT PORTS TO THE CHAMBER OPERATING IN OPPOSING DIRECTIONS. MOST HAND PUMPS ARE EITHER PISTON PUMPS OR PLUNGER PUMPS, AND ARE POSITIVE DISPLACEMENT.