AIR IV lubricator is a spring loaded piston pump driven by compressed air. The lubricator is suitable for single line resistance lubrication system (SLR) or positive displacement injector lubrication system (PDI). Work pressure is determined by the pressure of compressed air and discharge is determined by piston stroke and frequency. Lubricant is distributed to each lube point by distributors. SM programmed controllers fitted or programmed control system on user equipment can adjust injection periods and send low level alarms.