Replacement rear secondary air tube for Napoleon Timberwolf wood-burning stoves and fireplaces. Fits the following models: Timberwolf Wood Stoves: T2200 - Quantity of 3 is required EPI22 - Quantity of 3 is required TI2201 - Quantity of 3 is required Timberwolf part # W720-0155 Replaces old part # W720-0134 OEM Napoleon part