The Duravent 5DT-WT is a Wall Thimble, 5" from the Duravent DuraTech line, 5 inch diameter. Wall thimble that carries the chimney through a combustible wall at the required clearance.
DuraTech is Duravent's Class A all-fuel chimney system: a double wall pipe with a stainless steel inner liner and insulation for wood stoves, fireplaces, and oil or gas appliances that need a factory built chimney. Every DuraTech component is listed as part of the system, so use matching DuraTech 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 DuraTech line, along with the stoves and heaters it vents, and ships to dealers, contractors, and homeowners.