I am installing a watermaker on my 50 Post and one challenge I am having is how to fill the tank with the new fresh water. I would like to use a sanitary bulkhead fitting with a push to connect fitting threaded into it. The problem I am having is that there is no way to install a fitting as there is nothing on the tank to open for access. It appears that some of the other ports were added to the tank (I assume) by cutting a a hole in the tank and and then glueing a larger patch which has the fitting in it over the cutout. If this is the case, I could use a hole saw for the top, add the bulkhead fitting and then glue a slightly larger polypropylene circle over the new hole. I can’t think of a better way right now so my questions are… 1. has anyone added fittings to their tank and how did you go about it? 2. what did you use to glue/seal to polypropylene?