i think the factory set up is 3/4 or 1 pvc,which is a small drain and easily clogged, i've seen where you take 1 1/2 pvc and split it down the middle and glass this in the bottom. it is the same height as the 3/4 adn a lot more drainage.
joe, i think you can use foam if you coat the tank with the coal tar epoxy.
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