Worked great after a month. I used these spacers on a LG Red 3 zone mini split. I also added NyLog to the pads for extra protection, my HVAC tech got it working, he dropped it to 100 microns and it held up great. I'm not a ventilation specialist, I'm an electrician by trade. If you do everything you can to spec it, especially the torque settings, and have the tubes lined up exactly on the male side, you'll get it working every time. I have a total of 12 joints that I have installed them on. no leaks no problems.
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