I was skeptical at first at paying $20 for some plastic rings. Then I started taking apart the A/C lines on my wrangler. I don't want to say its impossible to disconnect without these, but these make things so much better. Two lines came off in 30 seconds, the third took twenty minutes of fiddling with and hitting with a hammer. They don't have instructions, but it's pretty simple. Wrap the ring around the line connection, with the tab part facing into the connection, and push inward. Note: Discharge the A/C lines first if possible.