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Willy, I found a place with acrylic colored tubing, tap plastics, but they only have 2 sizes, something around 1" and 2". Those tanks seem bigger than 3/4", just a guess they'd be the same. Was too big for me to consider.
Those colored Smok tanks are now polypropylene and are metric sized. The large one has an OD ~ 19.8mm.
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