The Duravent 5DVL-X6 is a Increaser Double Wall, 5"-6" from the Duravent DVL line, 5 inch diameter. Adapter that connects two sizes or two types of pipe in the vent run.
DVL is Duravent's double wall black stove pipe connector. The stainless steel inner wall and air gap cut the clearance to combustibles to 6 inches, which lets the stove sit closer to the wall than single wall pipe allows. Every DVL component is listed as part of the system, so use matching DVL parts throughout the run to keep the listing and the clearances valid. Check the appliance manual for the vent size and type it requires before ordering.
Rural Energy stocks the full Duravent DVL line, along with the stoves and heaters it vents, and ships to dealers, contractors, and homeowners.