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Coolant expansion tank cap compatibility: compatible with Land Rover Defender and Discovery 200TDI 300TDI models. Check engine code and reservoir style to confirm fit before ordering. OEM NTC7161 reservoir cap: direct replacement for OE NTC7161. Seals the coolant reservoir to regulate pressure and flow. Confirm part number and vehicle details for proper match. 15 psi pressure radiator cap: spring calibrated to 15 psi to help stabilize temperature, reduce boilover, and limit coolant loss. Suitable for daily driving, towing, and off road use. Black plastic coolant cap: molded plastic with integrated gasket for a tight seal. Textured grip enables tool free removal. Direct replacement with simple installation. Cooling system maintenance: helps keep coolant in the reservoir and equalize pressure during heat cycles. Useful for home garage service, fleet upkeep, and road trip spares to minimize unexpected downtime.