Ideal Expansion Vessels (Page 2)
The expansion vessel is a chamber that is used to protect closed water heating systems from excessive pressure. The pressure vessel is filled with air that acts as a cushion against surges in pressure within the system.

Ideal 075200 Central Heating Expansion Vessel Assembly - Response/Henrad CC
Part No: 1173960 / MPN: 075200

Ideal 075142 Expansion Vessel 9Ltr - Response Se/Systemiser SE/Henrad SEC
Part No: 1173922 / MPN: 075142