Heavy Duty Diesel Exhaust Muffler. This one can be used on any large diesel engine such as a medium duty truck generator or Marine application. This muffler has 4″ ID inlet and outlet ports on it. Overall dimensions are 36″ X16″ Nice heavy duty welded construction fresh from surplus. Walker PN#22843 GM PN#22843 NSN 2990-01-074-6772 Orignal application was a Detroit Diesel Engine power unit on a ship. Buy Here and Save $$$$$$$ here ?????? 11996