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<<snipped>> inexpensive fix which many of us utilized at that time was to
get a short PVC water pipe fitting.. about an inch and a half
long threaded with a flange around the end..and a thread on
ring, then with a round file carefully enlarged the hole a little
bit at a time until the PVC fitting would go thru the hole ( this
involved enlarging it from about 7/8 of an inch to 1 inch),
One virtue of using white PVC is that it's inexpensive, but its weakness is that is has lousy resistance to Ultraviolet. It's made to go inside walls and underground. It gets brittle with exposure to UV. A few bucks more will get you something that's UV resistant and has much thicker walls. A 1" diameter Marelon drain fitting is under $10. Personally, I'd go with a 1.5 inch Marelon drain for about $15, for the fastest draining possible. (see West Marine catalog, page 450)
And while you're at it, you might consider replacing the old hose <1" hose with a smooth-walled, chemically resistant, reinforced hose. Smooth means less chance of clogging, and chemically resistant means it won't disintegrate if you spill gasoline in the cockpit.
Fair winds,
Judy B