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Hi! I have absolutely the same system of carbonization. The cost turned out $45. Tank, gas pressure regulator and hose I bought offline. The stainless steel lid and quick-release valve bought on aliexpress. Tank capacity of 5 litres of gas in it about 3 kilograms. The refill bottle costs $3,5. Very cheap, right? Three months I carbonzero make homemade beer and sodas. Confirm, the pipe system is very easy to use at home. Russia, Novosibirsk.
My version of this CNC.