Just curious. Is there any performance gain to this. Or is it broken and just easier to remove than replace. How long does that thermal wax valve last before it goes. Is there a good way to test it? thanx jordan 11613 Jim Reeve <ultra@xxxx> wrote: I just grabbed the hot air pipe with my hand and yanked her right off. No need to do anything else with the heat stove or remaining opening unless your worried about cosmetics.