Brand New Generator Muffler for various Generators including Champion, Duramax, Firman, ECT. The muffler has a 9cm tube in length Please check images to see how we measure the tube's length to make sure it will fit! . Will not fit sone Honda Clones. For CHAMPION generator 6500/7800 CSA40017 For many clone 440cc 337cc 338 389 420 439 459 cc engine powered Durostar, Centurion, Champion, All Power, Duramax, DuroStar, Sigma, Gentron, Etq Wen, Westinghouse, UST, All Power, Powerhorse, Powermax etc. Generators. Includes the Muffer with mounting gasket & nuts. *Not compatible with mufflers that have a 10, 11 cm tube or bent 11cm tube.