Not Duravent, Poor A Vent. Stuff is overpriced garbage. Over the summer, I moved my P61A to a new location. The pellet pipe was a few years old, so I said what the heck, buy a few new lengths and start fresh. Installation was easy, starter collar to a 1-foot section to a 45 out the wall to an exhaust cap. I got a good lock on all connections, and put a smooth coat of RTV on all connections. I start the thing up in a dark room, and am shining a flashlight on the pipe to try and catch any leaks. No way this thing is going to leak, I say to myself, connections are solid. WRONG! It starts pouring smoke out of a seam halfway up the 1 foot section. Yeah, it will be easy to glob RTV on it and stop the leak once the stove cools down, but for the bleeping money you pay for that cr@p the least they could do is give you a decent product. Vaguely recall a thread about Simpson "premium" pellet pipe, which seems like a tacit admission that their present offering leaks like a sieve.