Herbie overflow modification?

[SauceK]

Hi guys, I recently planned my plumbing and opted to go durso overflow. But found out that my built in overflow are too small to accommodate the durso fitting for 1" and I can't go any smaller since my system is a 180g, and planning to have high sump turnover rate. I'm thinking about going herbie but don't have enough space in my overflow box. Can I get away with drilling a hole in the back and using a 90 facing upwards as my emergency drain? (pictured below) Since it is an emergency drain, I'm also planning on making it 1 1/4" so it can handle a more flow worse case scenario.

 

[Webslinger]

yep

 

[Larry L]

I think your idea for a Herbie setup would work. Another option for spaces too small for a Durso is to use a Maggie Muffler (www.maggiemuffler.com) which basically works like a Durso but in a smaller form factor. But in your case if you can find a way to make the emergency drain work, a Herbie setup is safer.

 

[ca1ore]

Yes, did that on an old 180 years ago. Just be certain the glass is not tempered.

 

[SauceK]

Cool, thanks for the input guys. It is an acrylic, so it should be a lot easier drilling. I'll go ahead and change my plans to this!