In-stock parts
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In-stock parts
Order by 2PM MST
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2045 West Buckeye Road
Phoenix AZ 85009
United States
The UnitedBuilt H04040MS grooved volute is the cast-iron pump case for selected clockwise 4x3 M3ZRM and M3ZRMS pumps. Its grooved connections and clockwise configuration distinguish it from threaded cases and the counterclockwise H04041MS volute.
Order H04040MS when replacing the case around the impeller while retaining the correct pump configuration. This product is the volute case, not a complete pump or powerhead. Select any required gasket, impeller or fastening hardware separately.
A replacement volute must match both the pump rotation and the connection arrangement. The clockwise case belongs with the clockwise pump components; using the opposite-rotation case is not a way to convert the existing assembly. Confirm the model and marked rotation rather than judging direction from an unfamiliar viewing position.
| Specification | Detail |
|---|---|
| Part number | H04040MS |
| Component | Volute case / impeller housing |
| Pump size | 4x3 |
| Rotation | Clockwise (CW) |
| Connections | Grooved |
| Material | Cast iron |
| Selection | Application |
|---|---|
| UnitedBuilt rope-seal pump | B66899MS, M3ZRM, CW |
| UnitedBuilt mechanical-seal pump | B68417MS, M3ZRMS, CW |
| Listed Berkeley grooved pumps | B66899 and B68417, CW |
| Check | What to confirm |
|---|---|
| Rotation and model | Match the existing clockwise pump and exact volute number. |
| Pipe connections | Confirm grooved connections; this is not a threaded-case replacement selection by size alone. |
| Related parts | Check the impeller, volute gasket and hardware required for the repair. |
Need help selecting the correct replacement part? Contact UnitedBuilt through online chat, email parts@unitedbuilt.com, or call 602-253-7750 with your pump model, existing part number or photos.
| Model Number | M3Z |
|---|---|
| Material | Cast Iron |
| Country of Origin | USA (subject to change) |
| UPC | 850087050081 |
| Weight | 42.0 lb |
| Finish | Rust Inhibiting Red Paint |
| Rotation | Clockwise (CW) |