Bosch Expansion Vessel 12L 87161425050

Worcester Expansion Vessel 87161425050

This part fits Worcester Heatslave:

Worcester Heatslave 41974 OSO

and Worcester Heatslave 41974 RSO

with Worcester Heatslave 15/19 OSO

plus Worcester Heatslave 15/19 RSO

also Worcester Heatslave 20/25 OSO

and Worcester Heatslave 20/25 RSO

with Worcester Heatslave26/32 OSO

Worcester Heatslave 26/32 RSO

The expansion vessel is a chamber .

Designed to protect water heating systems from excess pressure.

The expansion vessel is filled with air which acts as a cushion against system pressure surges