Halkey Roberts Valves for 1994 NRS raft

I have a 13 foot 1994 NRS Expedition raft and it has the old Halkey Roberts valves. I can't remember the model (I'll unroll my raft tonight and post the model number).

I ordered new ones from NRS and they do not thread into the nut (I know it says this on their website but I wanted to be sure).

NRS says you have to cut the boat to replace the valve. This just seems insane. It seems some people are still selling these old valves. Does anyone know of anywhere you can get them?

Any ideas...

Halkey Roberts Valves for 1994 NRS raft