The Hopper Extension is an easy to install, quality made in USA product that will fit any of the popular 2000 sq. ft. front door bay window pellet stove models like the Evolution, Summers Heat 55SHPEP and 55SHPEPL, the Englander 25-EP and the Timber Ridge 55-TRPEP found in Home Improvement centers and Hardware stores. Your stove's present hopper opening will be about 18 1/2 wide by 13 1/2 for this to fit. The Hoppers outside dimensions will be 20 3/4 wide by 15 3/4 front to back and 9 tall. You provide the stove, we provide all of the hardware, gaskets, mounted limit switch bracket (that accepts either the push button or lever style switch), extension wires and the easy to install instructions. We even included a set of instructions to help the lid issues while lessening the chance of future failure---for free! This improvement will put the final touches to making your stove a much friendlier machine to own and operate. It is easy and simple to install in minutes with the use of a small socket, a 3/16 drill and a pair of pliers, your pellet stove will hold 3 1/2 bags (around 140 lbs.) of pellets. This hopper extension may void your limited warranty. The manufacturer of this Hopper Extension is in no way liable for indirect, incidental or consequential damages in connection with this product including any costs or expense, providing substitute equipment or service during periods of malfunction or non-use. Please! Keep children, furniture, fixtures, and all combustible materials away from any heating appliance. Refer to the owner's manual for all clearances to combustible materials. No PO Box shipments-please! We are proud of our reputation and value your opinion so please ask any questions before you buy! Need a Hopper Extension for a different stove? Let us know what stove you have and how much capacity you would like to add! The more requests we get for your make and model, the better chance of us making one for you! Made in USA for you!