Known volumetric dispenser (dosing type), of the pressure relief action type. The pressure delivered by the lubrication pump pushes the oil agent to the precise storage of the piston in the dispenser, the pressure is relieved when the oil pump stops working and the dispenser piston delivers the quantitative oil agent to the lubrication point. Discharge precise, in a supply cycle dispenser only discharge oil once, and in the lubrication system in the distance between each other far, near, high, low, lying or vertical installation are no effect on the dispenser discharge. Forced oil discharge with sensitive action and two seals to prevent backflow of the discharged oil.