I’m building a new boat and got 2 sets of SM riser.
Both look different.
Can someone tell me if those are wet or dry riser
and explain why?
thanks for the help

alex

They both have water hookup’s so I would say wet. Not sure what extra nipple is for on second set unless that’s the water feed and it’s dry to there. Looks like someone modified the tail pipe.

Hook up water hose to lower nipples and see where water comes out.

Lets see the tailpipe view - maybe they were welded shut and the other connections are for water dumps.

Both should be dry and double walled.
One without nipple will discharge water at exit of exhaust.
One with nipple on top will discharge at upper nipple (for discharge out the hullside, making it visible from cockpit). This one should also have small hole at bottom of exit to allow water to drain when shut down.
If the one set that was extended isn't double walled, then it would be considered wet .

Thanks for the answer!

Exactly the extended one is double walled.
The one with the nipple isn’t.

So if i want to make it wet, I should just « close » the nipple and on the other one remove the double walled ?

thanks !