A-B1691556-AI TUBE-BREATHEROne New Aftermarket Replacement Breather Tube Fits Briggs and Stratton (B&S) Small Engines This aftermarket replacement breather tube (tube breather) is a crankcase ventilation component used on Fits Briggs and Stratton small gasoline engines. The breather tube routes crankcase vapors and helps prevent pressure buildup inside the engine, supporting clean, efficient engine operation. It is commonly found on engines powering lawn mowers, lawn tractors,