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I thought I stumped you on that one......... :D

1. You should have one plug in the front largest locker. The bow locker and side locker should drain into the one large locker. This large locker should have a plug and most likely a bilge pump.

2. You should also have 1 plug in the starboard sump area just before the splashwell.

There are also 2 thru hull drains that go out the stern of the boat in the splashwell area but these should not have plugs in them unless you have a specific reason for doing so.

So, for your 1988 20 foot model, you should have 2 one inch plugs.