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Does the rubber seal leak?

No. The seal actually isn’t rubber, Dura-Lite™ uses a specially formulated high heat Patented Silicone Grommet Tube-To-Header Seal System. The silicone grommet allows the tubes to expand and contract in the grommet/ header, which eliminates the typical tube-to-header failure mode and resulting leakage. All Dura-Lite™ Charge Air Coolers are manufactured 100% leak free.