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Q:I have a model 55358 BM-80c Serial # 0708d06381 well. It mounts from underneath and is held in place with 4 screws. I ordered the same Model # 55358 and it has flange around the top and will not mount from the bottom or has no holes for screws. I don't see any thing in the installation manual that says that it is a substitute for the bottom mount.
A:It does appear that this is designed to just drop into the opening. You will still need to seal it around the edge of the table with whatever method you choose.