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I've heard you also want to change all the O-rings to the green ones. Not sure if there is some refrigerant compatibility issue with the old ones or if it's more of a "good time to do it" thing. And then there's the oil issue, someone more knowledgeable will have to chime in on that.
Unless you are talking about replacing (effectively) the entire system like Arne and I did and not just converting the existing system to 134a. If you do the whole system, you'll have the green O-rings and ester oil included with that.
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Wally - '77 Martini 924, '85 300SD, '56 Austin-Healey 100, 2010 Triumph Anniversary Speed Triple
"The more things change, the more they suck." - Butthead (Mike Judge)
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