I just received my PP256 today, and I've been going through the parts/consumables kit to sort out what everything is. The only item I can't find a home for is what appears to be an extra, ball-type flow gauge. See the attached picture; I've placed it next to the Ar regulator/flow gauge ... it is the one with the blue top/bottom. I thought it might be a different flow rate for the existing flow gauge, but it is too large. Does anyone else have this?