The smoke stack cover ensures that no unwanted guests enter the barrel through the stack opening when not in use, that keeping your grill clean. Compatible with 3.4" diameter smoke stack from Traeger / Pit Boss and more Manufacturer. Note: Remove this product before regular hot smoke, reattach it after cooking is finished. If doing a cold smoke, keeping it covered will prevent smoke from escaping, helps this process go faster and get better results. Equipped with high-temperature resistant magnets, it helps seal and position the cover when in place. When smoking, it can be conveniently magnetically attached to the smoker without needing a dedicated storage space. Easy to use, no need to alter the original chimney structure, achieving nearly 100% chimney seal. It is recommended to use with our smoker accessories series upgraded grease bucket for even better smoker sealing effect. Made of sturdy metal, the product features high-temperature resistant magnets. Smoke Stack Cover for Pellet Grills, Chimney Cover for Traeger, Pit Boss. To seal the opening when not in use