Weber 63025 Replacement Water Pan for the 22 1/2" Smokey Mountain Cooker Weber part # 63025 Replacement Water Pan fits Weber 22 1/2" Smokey Mountain Cooker. Diameter of the water pan is approx 18 9/16" Porcelain Coated. Please visit Weber's website to ensure you order the correct parts for your specific grill. It is best to look up by serial #. The following link will also help you find the alpha numeric number. http://help.weber.com/schematics/#serial-number