Race Car Performance Alloy Horizontal Header Tank Part Number: OBPHE001 Capacity: 1.5 Litre Cap Sold Seperate. This is ideal for all types of car, it is made out of 2mm Alloy and is very light. It can be polished up to GLEAM under the bonnet of your show car, or to be used in a light weight race car. Size: 200mm (H) x 100mm (D), Standard Radiator Cap Top, 10mm In, 18mm Out, 8 mm Over Flow Pipe (NO CAP) This unit is designed to fit to a bulk head or some flat surface. Professionally manufactured in Obp Ltd factory by skilled tradesmen in England.