Caveat Emptor!
Horrible! Will never buy again. Used one at the end of a short pipe, and it actually flashed-over and exploded in my mouth, burning the crap out of the inside of the entire top of my mouth as well as leaving the most horrible taste in my mouth for a couple of days. Switched to Tar-Guard's; been using for months now with no such incidents, and much better overall performance too.
Rating: 1 stars