carb oring not on diagram Slide oring ever need replacing?

[Snake2715]

There is an oring that goes on the bottom of the carb slide, right below the hole that the main jet mounts in. I dont see this on the diagram.


A carb I was in today showed a little age on this oring, but was usable.. I have to imagine at some point one of these were bad on someone.. maybe there is no ill effect?




Just curious what the solution for that were if it were ever needed?