So I had only problem with the pellet grill I acquired. The pellet hopper would only hold 5 lbs of pellets. That meant for meats that require a longer cook, I would be adding pellets every 2-1/2-3 hours. The whole reasoning for using a pellet grill is to be able to set it and forget it. Having to add pellets every three hours, I might as well be smoking meat on an offset. This is a hopper extension adding a 20lbs of more pellets to the 5. This will give up to 20 hours of cooking time all depending on how hot you’re running your grill. Hello overnight brisket cooking away on the grill while we sleep.