Jabsco bilge pumps
I use a Jabsco Amazon universal p/n 29270-000. I just replaced mine last year so they are still available and you can ordered replacement/service parts if needed.
If you look back on page three of the forum you'll see a thread titled " electric pump in bilge" lot's of input plus photos of my manual pump installation.
My boat came with it already installed so I don't know if it fit in the origional diameter hole and it requires a 1/4 spacer be fabricated.
Welcome aboard, wander through the past forums, we've covered a lot of topics.