My '05 Patriot with the plastic coolant surge tank has a 7 psi radiator cap. It looks like a standard "Stant" or equivalent automotive radiator cap (the name on it is Motorad), but it doesn't seem to fit well.
It is real hard to get on/off and it looks like it is not seating properly.
It looks like the tabs are not deep enough to fit around the extra thick plastic of the tank (unlike a thin copper radiator neck would be).
I see on the website where the replacement surge tank is sold, that they also sell a cap for it. https://shop.findmyrvparts.com/surge...3-p/190014.htm
They want $25 for the cap. https://shop.findmyrvparts.com/searc...190056&Submit=
I'm wondering if this is a special cap for thick flange tanks (or if they are just marking up the price 100% for a regular automotive radiator cap.
Googling the 190056 part number does not turn up anything at Motorad or elsewhere (it is probably the vendors part number)
EDIT: i should also ask "is a 7 lb cap the correct one?". The one on the site to linked above looks to be a 16 lb cap.