2003 toyota tacoma. What screws in here?
It’s supposed to have a cap to keep debris out of the little valve in there. Looks like the high pressure side of the AC system. Could probably get one from any parts store.
Schrader valve for your ac
AC lines. One is high pressure and the other is low pressure. No idea which is which sorry.
Like other people said it’s for the air conditioning system when you are adding refrigerant or taking it out. I wouldn’t be too worried about not having one and if you are, just pick one up for five bucks from Autozone or O’Reilly’s.
Central tire inflation port
Peanus adapter