Service couplers on hoses used with A/C manifold sensor kits do not last forever. It's time to replace the ones I had with a new set of link valves which are a lot cheaper than buying a new set of gauges or a new set of hoses with the service valves installed. I have now used the new service valves several times without any problems. They appear to be well made, the price was good and the goods arrived on time.
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