JB weld is a glue/epoxy that adheres very well to metals.
If you were able to fasten a 1/2 threaded PVC piece through the top (and bottom), and connect the hoses to it (from the barbed tee, see below), you could close those openings with a threaded cap. It's not relevant for the system to be sealed, but it's always good when the unit could be tipped over.
I suggested a barbed T because it would reduce the amount of space that a real tee would take up. With a barbed tee, the area used wouldn't be much larger that the tubes themselves.
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