I have no idea if it's one way or two. It has a little flap at the bottom that's all i know. I replaced the one I had with this one that i bought at a hot rod shop. Like some other guys said, i might have filled the system too much and my catch tank is probably too small, will have to replace it with a bigger one until the system equalizes. Thanks !
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Originally Posted by CHANMADD
is that radiator cap a two or a one way .........
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