IIRC, that port accepted a steel tube with some sort of ferrule and nut with external threads (at least the versions from combine power units).
Take a look inside the port, and if it's straight threads and there's a machined area at the bottom to accept a ferrule that is the kind of thing you are looking for.
Looks like the (NLA) part # for the nut MAY be VT4911. Looks to be a big version of the #222-503 5/16" "hi-duty" nut with ferrule attached IH used on gas lines "back in the day".
My late Uncle had a VAC with combine pump and used heater hose (NOT a good idea) to feed oil to it and he and the local blacksmith made up a fitting from two pieces of electrical conduit brazed into a cast-iron elbow. NOT sure where they found the nut, and (IIRC) waterpump packing instead of the correct ferrule.
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Today's Featured Article - Trailering Your Tractor - by Curtis Von Fange. One of the fun things of summer and fall are the parades and tractor shows that go on across America. Many owners of tractors travel long distances to attend these shows and they usually take their restored iron along with them. Safe trailering practices and inspections will ensure that the event is a fun one. A good habit to develop when using a trailer is to give that �quick look over� before taking it on a trip. Before hooking up to it check the tongue for proper operation. The latche
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