Afaik UD isn't selling just the tubes which is a bummer since I've cracked 2 already. 1st time because I was a dummy and put a known tank cracking juice in there, 2nd time got a crack by the bottom threads. Currently gonna fire up #3 tomorrow.
I was really worried about having a carto tank, but starting out with the AGR really helped my confidence because of how it locks into place.
I do have 1 ibtanked so far and really love it, gonna save up and get more. The o rings on the ibtanked are snug but still just remember to not pick up you tank by the tank, pick it up by the pv.
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