I have a 5" stainless liner in my masonry chimney that I would like to hook up my 4" Pellet vent to. The PV is super vent by Selkirk, problem is I can't find a reducer for this connection anywhere! I could just take the liner out and vent directly into the clay flue chimney, but i would rather use the liner. If someone could point me in the right direction that would be great, thanks!