Thanks for the info guys. I was going to core the bottom so I could run screws into the bottom to hold the pumps down.
the box will be about 21" wide flange-flange with the bottom of the box being aprox 17 3/4" the box will be aprox 10" wide flange-flange.
What is the difference between pva and wax? I have read of people using both and I have read of people using one or the other. Is one better than the other?
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