| Type | 4-Circuit |
| Image | Supplier | Item Code | Short Description |
|---|---|---|---|
| | Watts Regulator Company | WAT 81005853 | HydroNexZZone4 81005853 |
| | Watts Regulator Company | WAT 81005874 | HydroNexZPumpZone4A 81005874 |
| | Watts Regulator Company | WAT 81005860 | HydroNex ZZone4A 81005860 |
| | Watts Regulator Company | WAT 81005881 | HydroNexZMixPumpZone4 81005881 |
| | Watts Regulator Company | WAT 81005887 | HydroNexZMixPumpZone4A 81005887 |
| | Watts Regulator Company | WAT 81005867 | HydroNexZPumpZone4 81005867 |
