depicts a cross section of a preferred embodiment of the present invention the embodiment consists of a cylinder of gas 100 connected to a regulator 600 which is in turn connected to a valve 300 this valve 300 is then secured to a needle 200 the needle 200 and or the valve 300 are secured to a linear drive mechanism 400 the pressure within cylinder 100 is preferably considerably higher than the outlet pressure of the regulator 600 regulator 600 is shown without detail but can be any of a variety of commercially available single or two stage pressure regulators capable of regulating gas pressures to a pre set or variable outlet pressure the connection of the various components is not depicted in detail but can be achieved through either rigid threaded welded taper lock etc means or flexible tubing o ring seal gasket seal means the length of such a connection can be varied depending upon the specifics of the desired application fig2 a c detail a preferred embodiment of a three way spool valve 300 that has been found particularly useful to control the flow of wine and gas the valve 300 consists of a piston 310 and a valve body 305 the piston 310 employs three o rings u2014.