Exhaust rain caps (also called exhaust weather caps or stack caps) fit over the top of vertical exhaust stacks to prevent rain, debris, and birds from entering the exhaust system when the engine is not running. The hinged flap opens automatically under exhaust gas pressure when the engine starts and closes by gravity when it stops — no manual operation required.

Suitable for tractors, trucks, generators, stationary engines, and any equipment with a vertical exhaust stack. Manufactured in zinc-plated or painted steel for corrosion resistance. Available in sizes to suit common exhaust stack diameters — select the size to match the outside diameter of your exhaust pipe or stack.