Through trial and error I found that my old faucets no longer work with the new self-closing jars. I bought this valve and was able to easily attach a canister, connect the valve to a hose on the fill line and add coolant. Read the directions on the can as some cans require R134A to stay upright. I only needed 4 ounces for my last can, so I put the can on the scale so I could close the valve after the correct amount was released into the air conditioning system.
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