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Just my opinion, but blowing a hole in your floor to DRAIN water is asking for water to come into your basement- you hear people say "my pump couldnt keep up with the water" That is because the water table has risen above your floor level and it will just blast up through the hole- If I was going to put a pump in a basement, Id blow a larger hole than needed, slide a sono tube in the hole and pour cement around the outside of the tube up to the floor level. Then remove the tube, and pour a floor for the pump. From there, Id seal ever crack in your basement with what ever the best product for that use is..
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