Its closed loop, but my resivoir is 5 gallons...with expansion holes for the liquid to expand and contract as temps change...(all external). The oil wouldnt work because it would float to the top of the resivoir but cool idea. I wanna try the air thing...aquarium tubing is 3/16" and my setup is 3/8"...anyone know of a T connector with 2 3/8" and one 3/16"? or better yet a Y? I could probably use a Y at the top because of simple vaccums...it would suck air into it...
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