Flange Middle Gasket, Natural Rubber 40A

I have 18 liters of carrying can. The other day, I took a note at the gas station in the thing of packing of the carrying can. It was said that the packing is old and not in use. I searched in the home center etc, but packing with inner diameter of about 60 mm is not sold. I found this packing with Monotaro. Moreover, I was able to buy it for about 100 yen. I discarded the old packing and replaced it for a new "packing for flanges". It fits perfectly. It seems that rubber is natural rubber. I feel that it can be used for a long time. Thank you.