Vent Flange problems

I picked up a generic grow tent off of Ebay and I have run into some problems with the vents. It has two 5 inch vents on the sides that I will be using for my Cool-tube, but the problem is no one makes 5 inch flanges! At least none that I have found.

Here is the tent. Obv it says nothing about 5 inch(127mm) vents. FML.
http://cgi.ebay.com/NEW-REFLECTIVE-INTERIOR-GROW-TENT-CABINET-HYDROPONICS-G_W0QQitemZ390103025627QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item5ad3f3c7db

I found a DIY tutorial how to make any size flanges that will solve my problem, but Id prefer not having to do any more DIY work.

If anyone has used this tent or run into this type of problem with other tents, Id greatly appreciate some help.

Thanks.

Buy a 6" wall penetration fitting or elbow from home depot . Cut a single - small slit (about an inch ) in the tent's vent opening.
Slide it through and your done !

torontoone said:

Buy a 6" wall penetration fitting or elbow from home depot . Cut a single - small slit (about an inch ) in the tent's vent opening.
Slide it through and your done !

Click to expand...

I ended up searching around lowes and came up with this.

It fits perfectly. 3 of the holes even line up which will work fine.

Thanks for the suggestion though.

HAHAHAh - Floor sink Flange ! Who'd of thunk ?