The Gretz composite heated pitot didn't fit into the chromed base, so you have to grind down the composite material with a scotch brite wheel and you also have to elongate the holes in the chrome base. I also did a bench test to make sure all the enunciators and control module worked OK. I even put the pitot in the freezer for 2 hours. It looks like this will get me through some minor icing conditions, which is why I purchased this. I live in Montana and plan to fly in the winter.
Finally I had to cut the oblong hole in the skin. All fits and workswell, now.