KettlePizza Basic Pizza Oven Kit For 22-Inch Charcoal Kettle Grills - KPB-22. KPB-22. Pizza Oven Boxes & Kits. Turn your charcoal kettle grill into your own backyard pizza kitchen with KettlePizza kits. The KettlePizza KPB-22 deluxe pizza oven kit is made of 304 stainless steel and is designed to fit both 18 1/2 and 22 1/2 inch charcoal kettle grills. The kit transforms your grill into a pizza oven by allowing you to access food without removing the lid. The stainless steel sleeve around the edge of the grill allows you to set the grill lid on top allowing the heat to remain stable as it rises up and flows over the pizza for a constant and even cooking. Each kit comes with one hi-temp thermometer and one 14-inch, aluminum pizza pan made in the USA. You can also use the kit to bake cookies too!