I decided to use Uniseals in place of bulkheads, what I have is 6x1" returns from the sump and a 1500gph overflow kit.
The reason for using uniseals is to cut down on the length of the plumbing sticking out the side of the tank. I managed to shave off about 2.5" so it's a substantial difference.
Here's a picture from 2 1/2 days ago when I filled the tank for test.
I have not doubt these will hold up for the long haul. Installing them take a little work and a lot of force to get the pipe through the uniseal, even with lubrication.
I have been abusing the seals 3+ times daily to try and intentionally create a leak with no luck, these things are solid.
What I mean by abusing is twisting, turning, pushing, pulling, and basically working the 1" pvc in a motion similar to what you would do to remove a fence post. I have even applied enough pressure I was worried the glass might break, I have not been gentle and still not a drop of water. There has also been some pretty drastic changes in day and night temps these past few days, so that's a little more abuse for the seals to with stand.
I'm 100% sure these will not leak, I am going to replace these seals due to the abuse I put them through but if anyone has considered using these one a tank I'd say it's definitely an option.
Just wanted to share my results to this point, I had no luck trying find information on whether or not they were safe to use in a glass aquarium.
Ok back to the abuse, I will keep posting results for the next couple days till I drain the tank, I am sure they will be the same.
The reason for using uniseals is to cut down on the length of the plumbing sticking out the side of the tank. I managed to shave off about 2.5" so it's a substantial difference.
Here's a picture from 2 1/2 days ago when I filled the tank for test.

I have not doubt these will hold up for the long haul. Installing them take a little work and a lot of force to get the pipe through the uniseal, even with lubrication.
I have been abusing the seals 3+ times daily to try and intentionally create a leak with no luck, these things are solid.
What I mean by abusing is twisting, turning, pushing, pulling, and basically working the 1" pvc in a motion similar to what you would do to remove a fence post. I have even applied enough pressure I was worried the glass might break, I have not been gentle and still not a drop of water. There has also been some pretty drastic changes in day and night temps these past few days, so that's a little more abuse for the seals to with stand.
I'm 100% sure these will not leak, I am going to replace these seals due to the abuse I put them through but if anyone has considered using these one a tank I'd say it's definitely an option.
Just wanted to share my results to this point, I had no luck trying find information on whether or not they were safe to use in a glass aquarium.
Ok back to the abuse, I will keep posting results for the next couple days till I drain the tank, I am sure they will be the same.