Just the tank and the remote line.
edit: I realize you don't need this but I modified the other designs slightly-
What I did to make the air get to the bottom of the chamber is buy a pvc piece at Lowe's that screws on to the quick release valve you can see pictured above. That piece fits into a 1/2 in (?) PVC pipe which I put a T connector at the end of and 2 short pieces coming off of that. Basically it makes it so the CO2 doesnt burst out of the pipe because the T piece splits it up and breaks the initial burst, and the 2 exits off the T makes the CO2 distribute nice and evenly low at the bottom of the chamber.
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