there are only 2.high side and low side.they look like a tire valve with a cap on it.one will have an L on the cap,and one will have an H on it.you need the L,your hose on your can will not fit the high side.you really can't hook the quick connect fitting on the hose to the wrong valve.
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hi I found one high side port but can't find any low side port. is it underneath or where is it? thanks
copy and paste this link,look at the first picture. Where is the low side pressure port to charge ac on saturn … www.justanswer.com › Saturn