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    As a leading manufacturer in the automotive aftermarket, Gates caps and thermostats cover a range of designs, temperature ratings, and vehicles to meet your repair or replacement needs. Find OE quality radiator, fuel, oil and DEF caps, with cap solution kits complete with the testers, parts and adaptors you need for easy and effective installation. When it comes to Gates thermostats, we quality control our factory assembly to assure accurate, reliable performance that you can trust.