M4 thread.
Never over-tighten.
Thermal grease is highly recommended, to help heat to transfer between the switch and the contact service of the metal service
Compatible with
- Dream boiler group (-10/2009)
- Dream solenoid boiler group (+10/2009)
- Arc/Elipse/Basic boiler group
- Arc solenoid boiler group
- Steel boiler group (2009+)
- Steel UNO Prof Coffee group (-2016)