This flap is what cuts off the air intake into the loading box and essentially stops the fire. Upon learning the extremely high cost of getting one of these from the manufacturer I decided to make my own. The disk/flap is basically a rubber piece of silicone type material sandwiched between 2 stainless steel discs....one of the disks is about 1/2 the diameter of the other disc. After 2 heating seasons I had to replace my original flap. I need to glue the silicone material to the discs and am wondering what type of adhesive to use? I need a good adhesive that can withstand fairly high temps during the burn cycles. I expect the finished product to be as good if not better than the ones AHS will send us at about $52+postage each. Once I assemble one of these I'll run it for a season. If it holds up well I'll be making more for the future and any WG owners out there wanting one can PM me and I'll keep in touch on this small project.