Review on 🔒 FlareSeal MSP-0406: Leak-Free SAE Flare Connections for Refrigerant Leaks in Refrigeration, HVAC, Ductless, Schrader Valve, or Mini Split Applications (1/4" - Mini Split Pack: (2) 1/4" and (2) 3/8") by Russell Rabbach

Using a DIY mini split setup, I couldn't seal two joints no matter how hard I tried. Not even Nilog could compare what was wrong with those joints. I ordered a set of these, stuck them into the bad connections and magically the connections closed tight. For what they are, they are absurdly expensive. For what they do, they are worth every penny. Somehow I expected that they have a rubber seal. No rubber, all thin metal. But they still work. If you've flared your line 3 times and still can't get rid of that last little leak, try these.