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I can buy Hoffman 1a vents for about $15 dollars each or Gorton vents for about $20 each (price includes tax and shipping on both). Searching all the posts I have seen mixed reviews on the Hoffman's. Some love them and some hate them because they are hard to adjust. Some say that you can't use the Gorton web site to gauge which size to use. For the small difference in price I don't want to by things twice. If I get the Gorton and it is the wrong size I can't adjust it. If I get the Hoffman and it turns out not to be adjustable then I haven't achieved what I am trying to do which is save fuel and have hot radiators. I do plan on getting Gorton #2's for the main vents.