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 In the diagram above, the bottle is holding 50 or 80psi. The pump is pumping the pressures into the bottle, and the gage is showing what pressure the bottle is at. Barbara is pumping the bottle up. This is two man job, because the pump is hard to push down after awhile. When this happens, the pump is unsteady, and can tip. To prevent this you need two people, one to hold the bottle and pump, and the other to pump.