> Did you use the one with the lil ping pong ball or the rubber flapper?
Mine is from West Marine and uses a rubber flap. I think I had to buy two to
get the thickness of the mounting flange high enough to clear the mushroom
through-hull underneath.
If I were to do it all over again, I would buy the one in their catalog that
is a larger diameter through-hull with an integral scupper, and upgrade the
cockpit drain at the same time. I've had dog hair clog my tiny cockpit
drain, and a large following sea breaking over the stern could fill the
cockpitmuch faster than the little stock drain system on my 1988 P19 could
ever hope to expel.
I don't have any experience with the ping-ping-ball type, but i suspect it
would interfere with the rudder if your drain is on the centerline like mine
is.