New 2 1/2" Zinc Plated Tractor Raincap Fits several Universal TractorsOne New Aftermarket Replacement 2 1 2 Inch Zinc Plated Tractor Raincap This zinc plated 2 1 2 inch raincap installs on the top of a tractor exhaust stack or muffler pipe to protect the engine from rain, snow, and debris entering the exhaust system when the engine is not running. The hinged flap opens automatically under exhaust pressure when the engine starts and closes tightly the instant exhaust flow stops, keeping moisture and foreign material out