Hope someone here can help me find a tank that is similar to the Tobeco Super Tank RBA but with a larger tank capacity. I have found that the design of this tank is the most reliable for temp control. The posts being integrated into the bottom cap as opposed to a rebuildable atty that screws into the bottom cap, I believe makes for a better connection which is required for temp control. Other tank designs with a screw in rebuildable atty do not seem to consistently, make a solid connection. I have two of the Tobeco Super Tank RBA's but would like to find a design with a larger tank. The Tobeco is only 2.5mls, I think. Or if someone knows where I can find a tank upgrade for this Tobeco, that would be great too. I bought 2 of the Tobecos for $15 each and would buy more at that price if I could find them... These are great little tanks.