Drilling for herbies

[mark]

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.

[midgetwaiter]

Originally Posted by mark

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.