Weber 63024 Replacement Water Pan for the 18 1/2" Smokey Mountain Cooker Weber 63024 Replacement Water Pan for the 18 1/2" Smokey Mountain Cooker Pan measures 14-1/2" in diameter. Porcelain Coated Water Pan. 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