So I answered my own question today. The ABS bulkheads I had were purchased from a very quality aquarium supplier. We were having alot of trouble with them and ended up tearing the tank down to get into the back overflow area to replace them. I checked with another LFS last night and their bulkheads were the same. This morning I drove to a not so local LFS and what a surprise. Their ABS bulkheads are a much superior quality. Thicker seal and locknuts that fits.

So the answer is, no, not all bulkheads are created equal.