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- Vehicle Compatibility: Compatible with BMW 1 Series F20 F21 F40 F45 at engine cooling flange locations; confirm flange shape and mounting points with your original part for secure sealing and reliable operation. - OEM Cross-Reference: Replace OEM 1439134 11531439134; compare part markings and connector profile with your existing component to ensure accurate selection and consistent system fit. - Function: Molded plastic cap seats at the flange to help reduce coolant leaks and vapor loss, supporting steady temperature control; black finish matches factory hardware and wipes clean during service. - Maintenance Tip: Replace a worn or cracked flange cap during routine service to help restore pressure and circulation; suitable for quick DIY or technician installation with basic tools. - Readiness: Keep a spare cap in the home garage, vehicle toolbox, or service bay to reduce downtime and stay prepared for commuting and trips.