I am looking to add a fuel dot to a couple of my three line gas systems. Where can these be purchased from? The style I am looking for is like the one reviewed here:



how do these work? I'm assuming there is extra fuel line which is connected to the plug portion. When the plug is removed this extra section is pulled out allowing the fuel probe to be inserted, the plug is replaced and the whole thing stuffed into the female port?

Thanks for any help!