I am a professional user and I was very disappointed with this tester. I've owned one for several years. The hose-to-thread connection loosened and started to twist so I couldn't screw it in tight. There is no sealing ring above the thread, it does not seal well. The tubing is too soft and flexible, resulting in inaccurate readings. I just bought a Lisle 20250 tester and am very happy with it. It was a great day when I threw this KD tester in the trash.
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