A transparent cover for the laundry tub can be made out of thick sheet plastic or plate glass. The plastic is easy to work with but suffers from the disadvantage that it bends up at the edges as the high humidity in the fermenter expands the underside of the sheet. For clarity in viewing and stability in operation plate glass about V4" thick is what you need, even though it is a bit difficult for an amateur to work with. So have your glass supplier cut it for you. A laundry tub usually has a shoulder a few centimetres below the top so get a piece of glass which will rest comfortably on this shoulder.
Two holes should be drilled in the cover, a largish one in the centre about 40 mm in diameter to take an immersion heater and another about 8 mm in diameter for a thermometer. A small notch on one edge will be useful for accommodating the power supply line if you intend to use a submersible circulating pump. Another refinement for a few extra dollars would be two holes for attaching a handle to lift the glass cover.
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