The present invention comprises: a transfer cart having a seating plate on which a plurality of gas containers can be securely seated, and having a wheel member to enable a worker to hold and transfer a frame member supported by the seating plate; a stopper device which is installed to surround a valve of the gas container and prevents the diffusion of a special gas into the air when the special gas leaks from the valve; an auxiliary container seated on the seating plate and filled with nitrogen gas to supply nitrogen gas into the stopper device; a scrubber which adsorbs and purifies harmful components contained in the special gas while discharging, to the outside of the stopper device, a special gas that is lost into the stopper device and thus increases the pressure inside the stopper device; and a connecting part connecting the stopper device to the auxiliary container and connecting the stopper device to the scrubber.
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