I have the same year as you, the brass ovbd is hooked to a pump, the plastic one drains directly into the bilge. Why I don't know why they did that but there is pmp, if you pull yr inspection cvr there you will see it and that's the 1 that goes ovbd. I pulled my pump and plugged the ovbd drain and I just use it for a fish box and my ice drai ns into the bilge.
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Tis better to be quiet and thought a fool than open your mouth and prove it!!
1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson 
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