No good under pressure. They don't have a little silver tube in the middle so I don't think they'll hold up. I tried using a fuel leak but I couldn't stop the leak. I also tried it on an air horse but it kept leaking. Cut off the ends both times. I used the old one I had with hoses and it worked both times so I really think he needs that little hose. But it connects the hoses very well, so if you're using something low pressure this might work.
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