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The green rings are supposedly slightly thicker to accomodate R-134 which is molecularly smaller and more prone to leakage. We've been using the green, blue and original black o-rings for several years now and there really doesn't seem to be any advantage of one over the other. If I recall correctly the green rings were originally designed for Fords that had an issue with leaks at their slip-connect fittings.
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ASE Certified Master Automotive Technician w/L1.
ASE Certified Master Medium/Heavy Truck Technician.
Certified EVT (Emergency Vehicle Technician)
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