It doesn't appear to be. Although it could be a taper between the id of the cylinder and the lug. The lug is a tab on the inside on the unit about 4" wide by 1" think. The callout is pointing to the line where the lug meets the id.
I will check out the taper symbols. You may be on to something...
I have a dimension on a drawing called out as "z 8", it points to the edge of the part. This is on a part that is protruding from the inside of a cylinder. Any idea what this means?
