{"product_id":"pcd100160r-radiator-expansion-bottle-cap","title":"Radiator Expansion Bottle Cap for Defender 110 – PCD100160R","description":"\u003cp\u003eThe radiator expansion bottle cap seals the coolant reservoir on the Defender's cooling system, maintaining the correct pressure differential that allows coolant to circulate between the expansion bottle and the radiator. A faulty or incorrect cap will fail to hold the specified system pressure, leading to coolant loss, overheating, and potential head gasket damage on both the 2.5 TD5 and 300Tdi engines. Replacing a worn cap restores the pressure relief and vacuum recovery function essential to the closed cooling circuit.\u003c\/p\u003e\n\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned to maintain the correct pressure rating for the Defender cooling system expansion bottle\u003c\/li\u003e\n\u003cli\u003eDirect fit replacement requiring no modification - remove old cap and fit to existing bottle neck\u003c\/li\u003e\n\u003cli\u003eSupplied to OEM specification, matching original Land Rover part reference PCD100160R\u003c\/li\u003e\n\u003cli\u003eInspect the expansion bottle for cracks or discolouration when replacing the cap; replace both together if the bottle shows signs of degradation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eVehicle Fitment\u003c\/h4\u003e\n\u003cp\u003eThis cap is compatible with the Land Rover Defender 110 across applicable model years and engine variants including the 300Tdi and TD5.\u003c\/p\u003e\n\u003cp\u003eNot sure about fitment? Feel free to get in touch at \u003ca href=\"mailto:info@thomasperformance.co.uk\"\u003einfo@thomasperformance.co.uk\u003c\/a\u003e\u003c\/p\u003e","brand":"Britpart","offers":[{"title":"Default Title","offer_id":55814906610008,"sku":"PCD100160R","price":4.9,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0890\/0070\/6392\/files\/PCD100160R_5-600x600.jpg?v=1758807951","url":"https:\/\/thomasperformance.co.uk\/products\/pcd100160r-radiator-expansion-bottle-cap","provider":"Thomas Performance Ltd","version":"1.0","type":"link"}