This part uses the following part numbers: Kentatsu - 7020120028 Federica Bugatti - H3101080324010 The spare part is compatible with the following boilers: Kentatsu Nobby Smart 24-2CS Kentatsu Nobby Smart 28-2CS Hi-therm Optimus 24 Kentatsu Nobby Smart 28-2CS Federica Bugatti ECO
