Selkirk Multi-fit pellet stove adapter. Designed to fit all 3″ and 3.5″ pellet stove exhaust outlets. Hose clamp can be tightened on any 3″ exhaust for a snug fit on the exterior, and hose clamp may be removed for any 3.5″ exhaust for a snug fit on the interior of the stove’s exhaust tailpipe. This adapter is approved for connection to Selkirk brand 4″ L vent, and Selkirk brand 6″ Direct Temp venting. PLEASE NOTE: To ensure there is a secure fit and no co leaks, High Temperature Silicone and 1/4″ Self Tapping Screws must be used for installation.