What color are the caps on the low pressure port and high pressure port?

Unfortunately, the caps on the high and low pressure automotive air conditioning service ports vary. In most cases, both caps will be black, but we have also seen them in grey, blue, and green. Sometimes they have an “H” or “L” to indicate High or Low pressure ports.

Wondering where your car or truck’s low-pressure port is located? Use our Port Locator.