The Zilmet Cal-Pro 12-Litre Heating Expansion Vessel & Sealed System Kit WW0012 is a red boiler expansion tank with a manufacturer warranty of 60 months. It has dimensions of 28 inches in height, 29 inches in length, and 29 inches in width, and weighs 365 grams. This kit includes the Zilmet brand expansion vessel and is ideal for heating systems, providing efficient performance and durability.