Is it part number 17 in this diagram?
If so, then THIS site says it's a Plug Viewer, for viewing your plugs of course. The big question is, which plugs and why would you want to?
Of course if it's not, then don't worry about why you haven't got a plug viewer, after all you don't know which plugs anyway.
PS. Doesn't it have a "y" in it?
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