Heatrae Heater Expansion Vessels
The expansion vessel is a small tank that is utilised to protect closed systems from excessive pressure. The tank is filled with air that acts as a cushion against pressure surges within the system.

Heatrae Sadia 95607988 Expansion Vessel - 2 Litre 4.1Bar - Heatstore/Multipoint
Part No: 1732410 / MPN: 95607988