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Old 04-24-2017, 09:44 PM   #1
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1964 17' Bambi II
1961 24' Tradewind
Strasburg , Pennsylvania
Join Date: Mar 2010
Posts: 777
Process for installing new closet flange on 1964 black tank

I am getting ready to install a new closet flange on top of my above-floor 1964 fiberglass black tank. The old flange is long gone (thrown out during renovation), but I believe it was screwed to the top of the tank. The screws were mostly gone and were ground flat when the tank was re-gelled.

Can I drill and tap the inset cast metal fitting for new screws to attach the new flange, or is it better to glue the new flange on?

I am really trying to find out if there is enough (total diameter) cast metal inset in the fiberglass to drill and tap. I believe the process will be straightforward enough if I can ascertain if there is enough metal there to do it.

Thanks for any advice or insights.

Ben
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Old 05-12-2017, 08:55 PM   #2
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1964 17' Bambi II
1961 24' Tradewind
Strasburg , Pennsylvania
Join Date: Mar 2010
Posts: 777
Yes you can...

Cast fitting can be drilled and tapped. I drilled 5 holes and tapped 4. There was a spot where I only hit fiberglass when drilling...no cast iron.
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