This should be a specification readily available online, however, I'm stumped if I can find it. Does anyone know the OD of wet exhaust elbow Onan 5mdkbh? Its a 5KW unit. I am comparing gensets. My existing unit is 1.5" and it would be a simpler and cheaper install if I can use the existing wet exhaust. I had been told (but unable to confirm) that the Onan uses a 2". By comparison the NL M673LD3 is 1.5".
Edit: It Took a bit but it seems it is 2", page 63 (or 65) here: