The thermostatic upper part can be replaced via an airlock function and the seat gasket on the spindle can also be cleaned while the system is under pressure.
 1 7780 00 – with threaded connection M 28 x 1.5
 1 7780 98 – with threaded connection M 30 x 1.5
| Code | Description | 
  | 
|---|---|---|
| 1 7780 00 | HERZ Changefix Tool for HERZ thermostatic inserts – M28 x 1.5 | 
  | 
| 1 7780 98 | HERZ Changefix Tool for HERZ thermostatic inserts “H” - M30 x 1.5 | 
  |