I mistakenly tossed the old cap from my fresh water cooled system and can’t seem to find a pic clear enough to read what the pressure rating was on it. I grabbed one from Autozone and just realized it’s a 20lb cap which seems really high. Does anyone know what the standard pressure is in marine freshwater cooled systems? This is an aftermarket system (not sure of brand) installed on an ‘02 5.0 GL-C. Thanks.
