He he, that's a PVC tee (inlet) for the drain valve (which will probably end up being somewhere else). The top has a 1/2" male NPT thread, which I converted to female, so that I could put my barb in. If my PVC res turns out well, it might connect directly to the pump, and have a screw cap coming out the top of the case.
Otherwise, the pumps is THAT big: it's resting against the front(inside) of the case. Venting will be an issue.
[edit] the tubing has been converted to 3/4 since that picture.
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