No it's just a pic I got off a old forum on another site. This is all the info I could really get off the forum. Quote from forum
"The overflow is made from 1" pipe so I would say it can handle about 400 gph
safely. I am using and eheim 1250 and after headloss I'm guessing I flow about 200 gph
through there and can see that it could definitely handle twice as much. You can use 1.5" pipe or even 2" pipe if you want and reduce it down to 1" at the elbows because each drain only needs to handle 1/2 of that flow.
I cut the slit using a dremel it's about 3/16" wide. If you look at the picture you can see that it has plenty of room for water to flow into. I could not be happier with the functionality of this easy DIY job. Once you see yours in action you'll see what I mean."
He also said it was really quiet. The only thing I would do different is cut 1/4" cuts every 1/4" about 3/4" deep to skim a lil more surface area. I'm new to the hobby so I didn't know if this was a good idea.
Sent from my iPhone using Aquarium Advice