A method of supplying gas to multiple gas-utilizing process units from a gas cabinet including an enclosure containing a gas supply vessel, said method comprising in a first mode of operation, flowing gas from the gas supply vessel through a flow circuitry including multiple sticks each of which is arranged for gas flow communication to a respective gas-utilizing process unit, and in a second mode of operation, isolating portions of the flow circuitry associated with selected ones of the multiple sticks from other portions of the flow circuitry, so that gas can be flowed to one or more of the sticks, while evacuating and purging other sticks, or otherwise closing same to flow of gas therethrough, wherein each gas supply vessel comprises a vessel containing gas and an interiorly mounted gas pressure regulator, arranged so that gas dispensed from the vessel flows through said gas pressure regulator prior to flow from the vessel to said flow circuitry coupled thereto, wherein each of said sticks is in the gas cabinet enclosure containing said gas supply vessel.