Liquids and semiliquids, such as thixotropic gels, oil and greases, are delivered to a discharge means according to a method and through the use of an apparatus powered by hydraulic fluid under pressure which is controlled by a valve for passage to a hydraulic motor that is, in turn, coupled to a pump used to withdraw and pressurize the material for delivery by a conduit line to the discharge means having a discharge orifice that is either nonclosable or synchronously opened. The material is discharged by controlled pressurization which is initiated and terminated by controlling the flow of hydraulic fluid to the hydraulic motor in response to actuation of a trigger or switch on the discharge means. A discharge gun and a lubricator collar are two preferred forms of the discharge means.