First I filled in the old screw holes with thickened epoxy and let that cure overnight. As it turns out someone had removed the core around the fitting, so it probably wasn't entirely necessary but can't hurt. While I was waiting for that to cure I took careful measurements of the old fitting and the new and modeled a new pad to 3d print.
I did a test by only printing the bottom 1/8" of the new model so I was sure it would fit the new fitting and cover the diameter of the old fitting. Once satisfied, I ran the full print through and waited for the application of epoxy to the screw holes to cure.
The next day I went back to the boat and cleaned up any high spots in the epoxy with some sandpaper and then tested the new pad. I predrilled the screw holes and then slathered a generous helping of 3M 4200 sealant to the underside of the pad and set it in place. Next, I added more 3M 4200 to the underside of the new fitting and lined up the holes and set that in place. Finally, I screwed it all down and cleaned up any excess squeeze-out.
The last thing to do was to connect up the washdown hose to the underside of the fitting with a hose clamp and I was done. Pretty satisfying to fully check something off my list even if it's a small project.
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