Radiator Cap

Go to the dealer.

If your car is Japanese, you can use a Sankei cap with no problem. ACDelco/Motorcraft for GM/Ford is sold at the parts stores and Rock Auto.
 
I've been using a duralast cap for a few months with no problems yet, my 20 year old cap wouldn't seal enough to suck water back from the overflow tank. It would suck air in instead.
 
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