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That particular dye requires the use of an injector (or having the system completely open.)
Somewhere around here in one of the garages, I have a small can of dye/refrigerant solution. It has a push-on connector that allows a shot of dye to be pushed into a sealed and running system via the low side port. Probably have had it for 10 or 15 years, don't recall which auto parts store I bought it from. If you can still find those, they make it easy to add dye without a lot of fuss.
I looked at that and according to the reviews the bottle and/or connection seems to break upon installation. This is the reason I was looking at the one I posted as it's in a metal can...like the refrigerant cans...that can be added to the system via a set of manifold gauges.
I was using that as an example, his link was for 1.7 Oz, versus the 1/4 Oz in that little bottle.
Based on the amount he said he's had to add (couple cans, every couple months) he's probably down to just a few PSI anyway.
When I have to add it gets down to 20 psi +- on the low side of course...
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