2 Pcs Toilet Tank Liner-40″x15.7″ Thicken Toilet Anti Condensation Kit with Aluminum Foil-Self Adhesive Toilet Tank Insulation Liner for Stopping Condensation to Prevent Water Damage

Two pieces. One did my tank with some width left over. Product description reads 40″x15.7″. I measured 39″x15.875″My tools … bucket, small plastic cup, a couple of washcloths. Flushed the toilet with the water turned off. About two or three inches of water remained. Used the small (6 oz?) flexible plastic cup to scoop most of it into a bucket. The washcloths did the rest. Not much need to dry the inside, but I did use a few paper towels.The adhesive didn’t grab hard, so I was able to reposition the sheet a few times. It did grab a bit, so I had to pull it away to ensure it was on the bottom all the way around. Once placed, I was able to press it in all around. I did place it so the two ends were at the end of the tank with no fixtures.My tank is wider at the top than the bottom, so you see how it created a “V” when fully in place. The full width of the sheet extended above the tank by about 4-1/2″ – wider than the top of the “V.” After using scissors to make it just below even with the top, I cut a length then used it as a patch. I went back around the entire sheet to press it more firmly into place.This tank sweats just terribly in the summer. I think this will solve the issue. I’ll update the review as appropriate.I like this product a lot. Seems to have solved an ongoing problem. Very pleased.