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Easy to Clean - Unlike most carboys, ours have smooth, rimless sides and a 4” wide mouth to reduce the residual yeast and sediment from sticking to the sides. This makes cleaning easier. Easy to Fill - The wide mouth opening reduces spillage and the need for additional equipment. Easy to Measure - Brilliantly clear with built-in 5-gallon and 6-gallon markers on the side for your convenience. The FerMonster XL 7 gallon also has a built-in 7-gallon marker. Built Right - It has enough capacity to use for primary fermentation as well as secondary. The lid is constructed as one piece for and airtight seal. Made with food-grade materials & BPA-free. Completely taste and odor-free and stain resistant. An optional solid lid is available that you can use to keep dust out when storing or you can alter the solid lid to fit your needs by adding your own holes.