These o-rings and valve seals are absolute junk quality, I ordered one and when I first got it the seals looked like junk and some parts were missing or coming loose so I figured mine just be bad one. I went ahead and replaced it with a new one only to see the same issues and with a junk gasket like this you're only going to get yourself into more trouble as the gaskets will cause the vacuum to leak and in some cases during the usage breaks off. and gets sucked into your air intake and possibly your engine.
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