Commando valve covers ?

If they have glue all the way around that tube, the only way they are coming off is by cutting through the outer vertically in several segments. I'd cut them off above the original and carefully grind 4-6 slices down around the perimeter, only going through the outer one. You won't be able to get close at the base. Going to be a PITA. Maybe some heat first to try and burn the adhesive out.