Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
The size tank that you need depends on how much AC work you do and the size of leaks that you encounter. It doesn't take much to pressurize a system one time. The bigger the bottle, the less you have to refill.
where do you get your can tap attachment to put a shradder valve in it?
Here is an
Amazon Link
to the regulator that we use.
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"Understanding a question is half an answer." I have learned more by being wrong, than I have by being right.