Dear ~ The household gas number starts with No, 1 1 digit, and the national gas number is NFG ~. The gas number can be inquired through the LCD screen of your own gas meter, so you can find the installation location of your own gas meter first, and then look at the gas meter. At the top of the LCD screen zui, there is a letter beginning with No, followed by a series of numbers. The invoice for paying the gas bill before can be found out. At the beginning of the fourth line of the invoice, there are