Replacement aluminium Header Tank expansion reservoir with sight gauge from AlliSport Ltd. Designed to replace the original plastic item. Covers all Land Rover Tdi model vehicles – (Discovery 200 and 300 and Defender 200 and 300). Also suits the Defender, Discovery 1 and Range Rover V8.    The original plastic items are prone to splitting along the seam caused by the constant heating and cooling. This upgrade eliminates the problem and also aids cooling. We manufacture the tank with high quality CNC stamp cut 2mm aluminium and is fully TIG welded by hand in house. Swaged pipe connections for extra pipe security. This tank uses the original mounts and hose connections and has been designed to take the original Land Rover pressure cap. Be aware that some other tanks use a sealed aluminium cap which does not allow for pressure release.