The two Genius Valves Adaptors

The Genius Radiator Valves are shipped with 2 adapters to maximise compatibility with existing TRV bodies: 

• The slim adapter fits TRV bodies which use the UK standard M30 x 1.5mm thread. This includes modern Drayton, Pegler and Honeywell TRVs. 

• The larger adapter (fatter) fits the Danfoss RA fitting, which is the standard, domestic Danfoss fitting for the past 25 years. 

Together these adapters cover over 80% of the TRVs currently in UK housing stock.

To see if a particular TRV is compatible, see our compatibility checker.