Don't listen to the bad reviews, I've used this product on many 410a HVAC systems, many many connections, not a single leak when I'm done, I always make backups in case it disappears forever, one of the best inventions. The KEY is getting it right, sandpapering the pipe and inner fitting until the copper shines and removing the copper dust with a dry, lint-free cloth, then a bead of sealant around the inside of the fitting and around the assembled one to brush pipe around together. And TWIST to activate then DO NOT MOVE THE KEY TAKES A GOOD 15 MINUTES TO GLUE FULLY TOGETHER WORKS EVERY TIME AND IT IS UP TO 500PSI AT 410A CHEM PRESSURE IN THE PIPELINE
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