Side Exhaust vs Transom

[s/v Jedi]

Our exhaust is 3" and that is the minimum size for the flappers available. For our 2" genset exhaust, I'm buying a short piece of fiberglass exhaust pipe (Centek makes that) so I can cut a 2" piece of that and epoxy it on the transom over the 2" thru-hull. After that, I can fit a flapper on there as well.

Like another poster wrote: these flappers are not 100% closed but they effectively block the momentum during a surge, so they are really nice indeed.

About the water separator: we have the Centek "GenSep" thingy on the generator. It replaces the loop between waterlift muffler and thru-hull. The nice thing is that if water backs up through the exhaust, this is the first place it ends up and it will just drain out of it through it's standard water drain. Only when the surge is big enough to fill the gensep up, some water will go down into the waterlift muffler... the rest will drain out overboard.

cheers,
Nick.