Water Type (CO2 Gas Expelled) Construction:- T hese extinguishers are identical in appearance and construction to soda acid type of extinguishers. The only exception is that instead of acid phial these extinguishers are provided with CO2 cartridge which is screwed to the cap of the extinguisher. The co2 cartridge has a sealing disc. The plunger has a piercing type nail attached to it in such a way that it will puncture the sealing disc of co2 cartridge when pushed down. A syphon tube is fitted inside so that it can be used in upright position.
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