Wrong. Put on my stopwatch when I started. It took 50 minutes to replace the adapter. You have to go under the toilet, unscrew its connection to the water supply, deal with the flood of water that ensues (1 bucket and 3 towels worth), and then screw in the new thingy.
https://www.amazon.com/Korky-528-Corky-Toilet-Universal/dp/B00002N6MY

