oder Smokers YS640 and YS640s Pellet Grill Cover - qualifies for free shipping New and improved, the Yoder Smokers YS640 and YS640s Pellet Grill Cover is custom-designed to fit your smoker. This newly designed cover features a waterproof liner to stop water intrusion and is fitted with vents to mitigate condensation. This will keep the surface of your grill dry when not in use. Heavy-duty clips fasten the cover tightly over the shelves to keep out rain, wind, snow and other elements.