DURAVENT 3PVL-X4ADS

3" To 4", Pellet Vent Appliance Pipe Adapter, Used To Attach Outlet When Increasing To 4" Pellet Vent, On Venting Stoves Above 4,000'. Must Seal Adapter To Appliance With High Temperature Sealant, Designed For Stoves That Burn Wood Pellets, Patent Pending