Barbecue grill control knobs allow you to adjust the flow of gas to the burners, which ultimately determines both the cooking temperature of your BBQ and flame height from each of the burners. If the control knobs are not connected properly, or are stripped you may not be able to properly regulate the cooking temperature of your barbecue. GrillSpot offers a large selection of BBQ Pro Barbecue Grill control knobs and bezels. If you can't find a part or accessory, just contact our friendly customer care team. We're here to help!