The Unbranded Ecotec Expansion Vessel 181051 is a genuine unbranded alternative to the Vaillant Ecotec Expansion Vessel 181051. (489915). The expansion vessel is a tank that is used to protect closed systems from pressure surges. The tank is filled with air that acts as a cushion against surges in pressure within the system.

• 10 Litre capacity
• Rectangular shape