It's almost a good idea to buy this before your old cap dies. Mine was leaking so I ordered these and quickly replaced them. The old one was probably original and 20 years old. Much easier to turn on and off the new version as the old one was in bad shape. Just hard and old and was a lot harder to take off.
853240, stainless steel
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Mishimoto MMRAD-WRA-87 Performance Aluminum Radiator for Jeep Wrangler YJ/TJ 1997-2006: Enhance Cooling Efficiency and Performance
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