These YJ 93842 Brass Angle Check Valves are very convenient and often the only way to connect a hose to equipment service ports. These valves are supplied in packs of three, but can also be purchased individually if desired. They are designed for a working pressure of 800psi and can therefore be used with R410A. I don't know if these valves are vacuum proof, but I see a lot of people using them for vacuuming and have used them myself on occasion.
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