Exhaust Rain Cap - 4" Plated Fits John Deere 4850 4650 9400 Fits Massey FOne New Aftermarket Replacement Exhaust Rain Cap Fits John Deere and Fits Massey Ferguson Tractors, Combines, and Harvesters This 4 inch plated exhaust rain cap mounts on top of a vertical exhaust stack to keep rain, snow, dirt, and debris out of the exhaust pipe when the engine is not running. The hinged flap opens automatically under exhaust pressure and closes when the engine is shut off, protecting the muffler and exhaust system from moisture and