afai

Hi can anyone look at the attached picture and tell me what is this cap call(circle in red)? and what is this metal tube for?
Just realize today, I am missing this cap. Is it important to have it?

Thanks for your help

Jon316G

iTrader: (1)

That is the low pressure side of the refrigerant line.
That cap is protecting the valve used to recharge your A/C.
Not a BIG deal, but you really should have that covered.
You also don't want dirt/debris to collect inside there and contaminate the refrigerant if you ever need to get it recharged.
Best to keep that inner area clean.

afai

thanks for your help~