|The compass filling aid is designed to be used for filling most standard aircraft compasses. The standpipe is simply attached to the compass with a supplied special rubber band. The compass is then filled and purged through the standpipe. When all air is removed, and the level in the standpipe is constant, the plug is then installed through the filled standpipe. Thus the need for submerging for proper filling is eliminated.|
I agree with Scott, the rubber band does not work well...you need to hold the tool tight to the compass with your fingers. But the tool itself is a huge time and fluid saver. Rather than submersing the entire compass, this tool allows you to fill it up and install the cap with no air bubbles.
Im not convinced about the special rubber band. The one that came with this terribly-overpriced item lasted about twenty seconds.