Michael wrote:

Thanks for the advice on replacing the joker valve on the output
side of the head, Everett. I'll see if I can't find a diagram telling
me where that is.

Michael

The Joker, or duck bill valve (because of it's it's disposition and
appearance) is located at the bottom of the pump barrel. Suggest you
pump out and rinse with water and pump out again before
dissassembling it.

Most are packaged with diagrams and directions. USE THE RIGHT SIZE!
Someone replaced mine before I got the boat, with the wrong size.
It worked sort of for a season, and I got disgusted and replaced
it with one that worked SO much better.

Terry K