Just FYI. I have a Norm Saley Goodall valve for my Schools. It works fine. Everything that Norm Saley makes works good!
However, (there always is) the Goodall valve is set up so that you take off the steam dome everytime you add water. Norm sets this up so that you just pull it off. No problem so far. But, what I have learned is that every time you touch metal (steam dome) to metal (painted boiler shell) when the paint is hot, you can easily scratch the boiler paint. Now, my Schools has some small scratch marks on the boiler around the steam dome. As many know, you are going to get burn marks near the firebox on the Schools so it may not matter. If and when I repaint the boiler, I will use the clack valve instead of the Goodall valve.
Dan Fuller
Carrollton, Texas