Also known as a membrane, it is a boiler part that is normally located within the diverter valve or hydraulic section of the Chaffoteaux boiler. Its main purpose is to move a pin that then operates a micro switch which in turn sends a signal to the printed circuit board. The signal is normally to indicate the pump is running or there is a demand for hot water. They are sometimes referred to as the pump proving ? flow diaphragm or the domestic hot water DHW diaphragm.
Chaffoteaux 60081977 Diaphragm

Part: 60081977

Price: £14.17
Chaffoteaux 571547 Diaphragm

Part: 571547

Price: £4.00
Chaffoteaux Diaphragm 61400278

Part: 61400278

Price: £14.51
Chaffoteaux 60100506-30 Celtic Repair Kit

Part: 60100506-30

Price: £42.66
Chaffoteaux 60019016-10 Diaphragm

Part: 60019016-10

Price: £12.00
Chaffoteaux 60010419 Diaphragm

Part: 60010419

Price: £4.35
Chaffoteaux 60025809-30 Diaphragm

Part: 60025809-30

Price: £8.15