I have the valve that you're talking about. I bought it at Agri-Supply in Petersburg, VA. They have a web site, www.agri-supply.com , where you can order it.
The valve has a smaller thread than the tank. It takes an adapter bushing to make it fit. I bought that in the store at the same time. You should be able to get the adapter at any good hardware store. Take the plug and the valve with you.
I like it so much better than the top fill valve that I had before. I buried the tank 1 foot deep. the valve and supply hose is now that deep in the ground. I hope it won't freeze this winter.
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