I googled the patent number and found the following info. The figures on the patent sketches looks slightly different than the piece. Patent number: US 3497806
Up for sale is a US Carburetor Inc Type C Kit which specifically fits my old Generac GP5500 and is intended to allow the generator to run from NG or LPG in addition to standard gasoline. It may fit others but this is what I bought it for. However, it is not just the type C Kit.
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