Triple Wall Pipe Section - 2.5”Strongly recommended where your chimney pipe exits the stove jack in your tent or shelter, the Winnerwell 2. 5 Triple Wall Pipe Section is compatible with medium size Winnerwell wood stoves with 2. 5 diameter pipes. The triple wall design prevents the hot flue pipe from directly contacting your exit point. The exterior diameter is 4. 7 inches and is designed to fit perfectly with Winnerwell Silicone Flashing Kit.