If you are going to install anything with 5/8 lines I highly recommend you use two 15 inch adjust wrenches. Or at least a 15 and a 12. Two 12s would work if the connections are very easy to access.
I had to add some R-410a yesterday because it was getting low because of a very slow leak.
The 1/4 and 3/8 lines on my smaller split never leaked, it's these darn 5/8 lines.
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