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 H04041MS grooved volute is a cast-iron replacement case for selected counterclockwise 4x3 M3ZRM and M3ZRMS pumps. It surrounds the impeller and provides the grooved connection arrangement for the listed pump configurations.
Select H04041MS for the counterclockwise case, not the clockwise H04040MS version. This is the volute component, not a complete pump or powerhead; the impeller, gasket and fastening hardware are separate parts to consider for the repair.
Matching the case to the existing rotation avoids mixing clockwise and counterclockwise pump components. Connection style is a separate check: a grooved case is not the same selection as a threaded case simply because both pumps are called 4x3. Use the pump model and existing part identification to confirm the required version.
| Specification | Detail |
|---|---|
| Part number | H04041MS |
| Component | Volute case / impeller housing |
| Pump size | 4x3 |
| Rotation | Counterclockwise (CCW) |
| Connections | Grooved |
| Material | Cast iron |
| Selection | Application |
|---|---|
| UnitedBuilt rope-seal pump | B66895MS, M3ZRM, CCW |
| UnitedBuilt mechanical-seal pump | B68416MS, M3ZRMS, CCW |
| Listed Berkeley grooved pumps | B66895 and B68416, CCW |
| Check | What to confirm |
|---|---|
| Exact version | Match H04041MS to the counterclockwise pump configuration. |
| Connection arrangement | Confirm the existing plumbing uses the required grooved connections. |
| Assembly condition | Check the impeller, mating surfaces and volute gasket before selecting additional repair parts. |
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 | 850087050098 |
| Weight | 42.0 lb |
| Finish | Rust Inhibiting Red Paint |
| Rotation | Counter Clockwise (CCW) |