Maximator Nitrogen Pump MAXIMATOR high efficiency pumps are ideal for a broad variety of oil, water and chemical applications. MAXIMATOR pumps are air driven at a drive air pressure of 1 to 10 bar (14, 5 to 145 psi). Basically the principle of operation is similar to a reciprocating amplifier where control of the piston at the end position is regulated by a pilot operated 4/2 way valve. M series M...-2 series M...-3 series M...D series MO series MO...D series MSF series S series S...D series S...-SS series G series G...-2 series G...D series GSF series GX series GPD Series