I use this test gauge to check R-22 and R-410a in AC units that appear to be operating normally. No reason to remove refrigerant from a system into a liquid hose if an AC unit is operating well. Every time you hook up a manifold gauge to the discharge (liquid) service port, you fill your hose full of liquid refrigerant from the system. With this test gauge, you prevent this from happening.
EricD
Cincinnati, OH
5 years ago
Verified Buyer
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