Originally Posted by MadMax
All the gauge does is show if the ID of the oring is too small which occurs because the retainer ring is squishing it to a smaller diameter. If the ID is too small, it'll stop the tube from falling past so it'll sit high.
If the ID is at the design spec for the tank, the gauge will fall in and fall back out.
I'm under the impression that this means that the propane inside will push it back out.
In this case--Is there any chance of the gauging tool falling into the tank and becoming lodged inside?