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Message: <blockquote data-quote="tyromeo55" data-source="post: 2011165" data-attributes="member: 1719"><p>He is not wanting to vent it. he is wanting to get a mechanic to install it for him.  and it is not a license it is a certificate that can be easily obtained via an online test if you are worried about it.  Look into a 609 certificate.  ( I'm fairly sure 1# or less cans of 134A and topping off a 134A system does not require a 609 )</p></blockquote><p></p>