Automatic Transmission Cooler Lines

I knew there wasn't enough line pressure to bust a neoprene hose unless it was rotten.
I still wouldn't use it though. My homemade lines do look to be made of neoprene at first glance but only because I slid it over the homemade steel lines to serve as a protective outer shell.
If my only problem was a hole in a otherwise good steel line. I would install a compression union at the hole and be done.