The Ariston Andris Kit A 2L Expansion Vessel 3.5 Bar with 15mm Check Valve is a reliable water heater accessory designed for use with Ariston brand water heaters. Made from brass and steel, this expansion vessel has a capacity of 2 litres and operates at a maximum temperature of 99°C. It features a single check valve for added convenience and is compatible with the Andris Kit A model. With a compact design and a white colour, this expansion vessel is a practical and efficient addition to your home heating system.