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That style of pressure switch is a dated design more commonly seen in commercial use.
The one fitted is probably ALCO.
This is probably the modern equivalent you need.
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Firebird Combi Pressure Switch, ACC000PSW
This switch acts as a safety device to stop the boiler firing when there is low water pressure. This is to stop possible build up of heat and damage of the boiler jacket.heatingpartswarehouse.co.uk
I lost track of it but when searching I found a link stating universal Low pressure switch, supplied with adapter to fit most boilers.
Disclaimer, check suitablity for specific boiler.
I just go into heating world of spares and they use parts arena for identifying bits.
Reply to the thread, titled "Rhino boiler component ID" which is posted in Boiler Advice Forum on Plumbers Forums.
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