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This is a genuine Cummins Onan exhaust tube kit sized for QG 3600 and QG 4000 generator models, used to replace a rusted-through or damaged factory tailpipe.
It bolts on in place of the original tube using the factory mounting points, with a stainless steel finish for better corrosion resistance than a painted tailpipe.
A straightforward replacement part for keeping an Onan generator's exhaust system sealed and rust-free.