I found the funnel with float at Walmart. It was with the gas cans. I've already pulled the the sticker, so I don't have the name. Sorry. It fits in the fuel port of the TC30 perfectly and stands upright by itself. I just have to pour the fuel and watch for the float to send up its little stem. Worked like a charm.
It may sound ridiculous to some for me to have several small fuel cans, but I will be using very little fuel, probably average a tank full per month. These little cans are not a problem and very easy to handle. They even lessened my hatred for those self venting spouts.