Strongly recommended where your chimney pipe exits the stove jack in your tent or shelter, the Winnerwell 3.5” Triple Wall Pipe Section is compatible with large size Winnerwell wood stoves with 3.5” 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.