This fixed the leak. 1999 Cherokee with 240,000 miles. Good price compared to the dealer. I just used a large o-ring. The old one was flat and not elastic. I didn't try to remove the center piece because I didn't know if other o-rings would fit. They seemed too big (see photo). But after twisting to remove and install, the factory small o-rings will not leak. They don't see as much heat as those on the block. You need that beat. https://www.amazon.com/dp/B0002SR2S8/
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