Product review (1 stars): A waste of money
Will not stay in flue pipe. It needs 2 spring loaded arms on the back, which is what I thought it would have, as all the old ones I've seen do. This did not show a picture of the back on Amazon and now I know why. This has a flat piece of metal on the back that has to be bent up on both sides. After bending just enough so you can actually insert it in the flue, it just falls back out due to gravity.