Someone had replaced the original radiator cap with this cheap 1.1 pressure cap which was the wrong pressure and my subaru wrx was overheating in traffic and the cap would leak. I purchased the oem one, put it on it fits perfectly of course! Also my car isnt overheating anymore. Only use oem caps on stock radiators dont change the radiator cap psi unless your using an aftermarket radiator like koyorad. Recommend on all subaru radiators for replacement.