I've had the exact same scupper valve for 5 years now, same rubber flap, etc. It barely leaks, has always worked well, etc.
In the process of refoaming, I put a new tube in, used 2 street 45's to offset the inlet to under the intermediate housing, and just redid the outlet like I always have.
This works well for me.
I seal the pvc pipe to the hull (used PL roof and flashing sealant this time around instead of 3M), let that set up, then grind the pipe so it's slightly recessed from the outside of the hull, then run a bead of 3M all the way around it, then screw the ring on with a CD underneath. The CD gives me a smooth finish on the 3M, and the 3M stays flexible so the rubber flap has a nice surface to seal against. The ring gives even pressure all the way around.
You have to cut holes in the CD for the screws to go through, plus I have to chop one side off to clear the HIN plate.
It's worked so far, and 5 years on the same flap tells me it's a good technique.
In the process of refoaming, I put a new tube in, used 2 street 45's to offset the inlet to under the intermediate housing, and just redid the outlet like I always have.
This works well for me.
I seal the pvc pipe to the hull (used PL roof and flashing sealant this time around instead of 3M), let that set up, then grind the pipe so it's slightly recessed from the outside of the hull, then run a bead of 3M all the way around it, then screw the ring on with a CD underneath. The CD gives me a smooth finish on the 3M, and the 3M stays flexible so the rubber flap has a nice surface to seal against. The ring gives even pressure all the way around.
You have to cut holes in the CD for the screws to go through, plus I have to chop one side off to clear the HIN plate.
It's worked so far, and 5 years on the same flap tells me it's a good technique.
