Here is a T8 with the flexwatt installed (in the center for use with the divider)
You can see the outline where the flexwatt would go (as well as the thermostat probe slot) if I was not using the divider as well.
Checkout this thread: http://ball-pythons.net/forums/showt...With-Pictures!
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You can just use the pieces AP sent with it, I like a little more but it isn't necessary. Walmart/home depot usually has foil tape.
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They aren't cheap, but it is an up front investment. you will pay just as much in gradually upgrading tanks over time if not more. Tubs are a different story but they serve a different purpose.