I've had drilled tanks with bulkheads for going on 8 years now and have never had one fail on me or spring a leak.![]()
Bulkhead failures are from error. If you are worried about one failing switch to schedule80 fittings, they are alot thicker.
The only issues that have ever happened to me is from initial setup. You know, a dirp here and there because it wasn't tight enough. But once they were on, no problems.