I used this tool to disconnect the heater hoses on my 1998 Ford F-150. I needed a smaller end. After some struggle with the tool, I just resigned myself to being unlucky and used a pair of small needle nose pliers instead. After removing the quick connector I used the tool to see if that could do it, and it would be possible, although it could rupture the pipes on the heater core with the pressure I had to use. Nice tool for an old heater core, but I wouldn't recommend using it for anything you care about.
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