Fits, doesn't leak. those are o-rings. Fits 2001 Ford 5.4L injectors. Comes with 8 per pack, just know you need 2 o-rings per injector, 1 on top and 1 on bottom. They also come with a handy little tool for attaching O-rings to the tips. I just didn't get the significant performance boost I was hoping for. (JK)
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