Drilling Overflow Box to run return locline

[jbird0420]

Hi all,

The return lines for my aquarium have no pre cut holes drilled into the top of the overflow boxes to run my return line locline.

Instead of running the plumbing up and over the overflow. I'm looking for a more cleaner look and I was wondering If I drill the overflow box where the teeth are at and use a hole saw to drill the hole. Will I be able to drill into the overflow box 3/4" hole for the return without cracking the whole overflow box?
Hope that makes sense. Thanks!

 

[mcgyvr]

Is the overflow box plastic or glass?
As long as the box isn't tempered glass you "should" be able to drill a hole in whatever it is and not crack it.

 

[jbird0420]

Is the overflow box plastic or glass?
As long as the box isn't tempered glass you "should" be able to drill a hole in whatever it is and not crack it.

It's plastic and pretty thick. Doesn't seem to flex when i put pressure on it.

 

[mcgyvr]

It's plastic and pretty thick. Doesn't seem to flex when i put pressure on it.

Drill away..