This is a snap on plastic tray made for the model 200/200A lantern. It will also fit the model 502 stove. You would snap it on to the bottom of the tank to carry extra generators, mantles, matches, or whatever. It comes with a generator wrench, pump lube, and silk lite mantles. These have not been made in many years. Too bad. They really are a handy product to keep your lantern stuff from getting lost.