The VXLO Injector meters and displaces positive volumes of lubricant to individual lubrication points. Each injector in a system is independent of each other. The volume displaced by each injector is controlled by the interchangeable metering screws. These injectors are indirect feed (post fire injectors), discharging lubricant to the lubrication point via spring force when mainline pressure is relieved. The total volume of lubricant fed to each point is dependent on the metering screw rate and the cycle frequency of the lubricator.