3" PelletVent PRO, Stainless Steel Appliance Adapter.
This is a 3" Appliance Adapter, this is from the PelletVent Pro Line. It has the duralock tightening system, to get a tight fit. Attach this to the appliance outlet to allow for an easy pipe connection. This allows connection of 4" vent to 3" appliance outlet. Use high temp sealant to seal the adapter after attached.