Transmission Cooler Line Repair

you have to be careful when you tell someone rubber lines will work. Many years ago, I told my teenage son''s best friend something similar when he had twisted off the line ends at the rad. A few days later, I get a call from this guy saying he broke down at an intersection nearby. I show up, and there is ATF everywhere. I help him push it to the far shoulder, and pop the hood. Apparently, he had used vacuum hose to mend the line. It had worked for a short time, but when the car had fully warmed up, the high pressure side had swelled up like a balloon. When he gave it gas off the line when the signal had turned green, this balloon swelled enough to get hit by the fan blades and it blew several quarts of ATF everywhere. When I realized what had happened, I couldn't stop laughing, the visual was hilarious.
So, yeah, you can use fuel injection hose and FI hose clamps, temporarily. But some flared fuel line and a coupling is much better.