Pipe conversion

I bought an Earth Stove pellet stove today. I have a 6 inch liner already installed where I want the stove to go. I need to convert the 4 inch liner to the 6 inch I have installed. I found a few 15 dollar options that are not stainless steel. Can I use this? Or do I have to use the more expensive stainless options?

You don't have to use stainless. Stainless will fight rust better and is generally more maintenance free that way. What are you using though?

$15! My 6" to 3" adapter was $45. I am jealous!

Will this work???

http://www.amazon.com/Norwesco-Stee...360642653&sr=1-8&keywords=Stove reducer steel

That will rust and even rot out over time. If this reducer is easy to get to, it might be worth it. If it's a pain to get to, you might as well spring for the better part.

What about this one? It says it is galvanized?????

http://www.ventingpipe.com/metalbes...to-6-chimney-adapter/p1069362?recs=igodigital

Or this one? This one says galvanized on the outer layer and stainless on the inside...will the outside rust?

http://www.ventingpipe.com/duravent-4pvp-x6-4-inch-6-inch-pellet-chimney-adapter/p1760896

The second one is the one you need. It being double wall will help keep it from rusting. The single wall black pipe eventually rusts from the combination of heat and condensation. The heat can compromise the finish over time and lead to the pipe rusting. The double wall doesn't get the outside pipe hot enough to break down the finish.
I'm not sure if I explained it right but, the ultimate "it should not rust" is right.

Yep. Second one will work.