It is a pipe plug, used to lock pump from turning when serviceing pump. They went to a hex plug with a hole in the end for a locking pin. Don't ask me why as I never locked that model pump when working on them. I doesn't lead to a pressurized galley but it goes right into the sump that is running in oil from your engine. Just plug it up, and of course, see how much oil you lost. I have seen the idle adjustment plunger fall out and lose the engine oil but not that plug.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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