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Old 09-27-2008, 07:36 PM
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Default Drilling for herbies

I want to drill two more holes in my 65 but I need some advice. The overflow is 8" x 6" with one hole and I want to make it dual herbie style. In my search I found the general rule of drilling at least a hole width apart. Think I can get away with another hole in my overflow area? Here's a pic

I am also drilling a return at the top left.
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Old 09-27-2008, 09:06 PM
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When I've seen Herbies with an overflow, there's been two holes in the bottom of the overflow. For something you have without changing the overflow box, wondering if a just a bulkhead below the existing hole (for the primary drain), then a up turned 90° on the top hole for the secondary drain.

Last edited by mark; 09-27-2008 at 09:14 PM.
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Old 09-27-2008, 09:07 PM
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Old 09-27-2008, 09:37 PM
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good idea! Thanks Mark
As for return I haven't decided, just one on the left or two returns one either side...hmm
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Old 09-27-2008, 10:20 PM
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since you getting the drill out anyways, 2 returns wouldn't hurt
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Old 09-28-2008, 07:39 AM
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Quote:
Originally Posted by mark View Post
When I've seen Herbies with an overflow, there's been two holes in the bottom of the overflow. For something you have without changing the overflow box, wondering if a just a bulkhead below the existing hole (for the primary drain), then a up turned 90° on the top hole for the secondary drain.
That should work. I have 2 holes side by side in the back glass with a box around them. One is restricted with valve and the other has a 90 on it so the backup is out of the water, works good.
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