I keep a keg oring replacement set on hand, you can find them at homebrewing shops and online. Kegging for 10 years and can’t think of more than 2 or 3 I’ve ever changed. Good to have ready when you need though.
Thanks JRB, I will get a set to have on hand. Just didn't think they would last this long. Didn't think my little tank of CO2 would last this long either. Took it in last week for a refill and he nicely told me I still had half tank! And then he showed me how to read the code/tare weight on the tank. Then he tried to get an invitation over to my house to drink beer!