What are the thread designations for high side and low side service ports on r12 and r134 a/c systems?

Question:

Answers:
The high side will be red cap, the low will be blue cap. In some cases the high side is the larger of the two. Try out this link:

http://www.ask.com/web?q=auto+air&qsrc=0&o=0

Good Luck

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