GRUNDFOS · STACK KITS
CR, CRI, CRN 1s, 1, 3 and 5 Stack Kits
Genuine Grundfos chamber stack kits for CR, CRI, CRN 1s, 1, 3 and 5 pumps: the impellers, chambers and bearings of the pump, matched to each pump model.
221 Stack Kits
Fits CR, CRI, CRN 1s, 1, 3 and 5
SiC/SiC bearings
Matched to Pump Model
Genuine Grundfos
Overview
A stack kit is the chamber stack of a Grundfos vertical multistage pump: the stage chambers, impellers and intermediate bearings that make the head. Grundfos lists one kit for every pump model, so the kit is chosen by the pump size, then the exact model from the nameplate, then the version.
What Ships and What It Needs to Run
Included: the chamber stack kit for the pump model and version in the selected option (Grundfos price list).
Not included: the shaft seal and the gasket kit, which are ordered separately (Grundfos price list).
Genuine Grundfos equipment, factory-new in original packaging — sold and supported by Watermain Supply, an independent industrial supplier.
Warranty: 24 months from date of installation, but not more than 30 months from date of manufacture (Grundfos limited warranty). Grundfos repairs or replaces its own product; costs of removal, installation and transportation are not covered, and products sold but not manufactured by Grundfos carry their own manufacturer’s warranty.
Specifications
| Specification |
Value |
| Product |
Chamber stack kit (STACK, a registered trademark of Grundfos Pumps Corporation) |
| Fits |
Grundfos CR, CRI, CRN 1s, 1, 3 and 5 pumps |
| Bearings |
SiC/SiC bearings |
| Not included |
Shaft seal and gasket kits |
Pump Sizes in This Listing
| Pump size |
Stack kits listed |
Versions |
| CR, CRI 1s |
19 models, 2 to 27 |
Standard |
| CRN 1s |
19 models, 2 to 27 |
Standard |
| CR, CRI 1 |
18 models, 2 to 27 |
Standard |
| CRN 1 |
19 models, 2 to 27 |
Standard |
| CRNE 1 |
1 model, 23 |
High Pressure HS, EPDM, High Pressure HS, FKM |
| CR, CRI 3 |
18 models, 2 to 25 |
Standard, Low NPSH |
| CRN 3 |
18 models, 2 to 25 |
Standard, Low NPSH |
| CRNE 3 |
1 model, 23 |
High Pressure HS, EPDM, High Pressure HS, FKM |
| CR, CRI 5 |
19 models, 2 to 24 |
Standard, Low NPSH |
| CRN 5 |
19 models, 2 to 24 |
Standard, Low NPSH, High Pressure SF, EPDM, High Pressure SF, FKM |
Before You Buy — The Limits That Decide the Fit
| Check |
What decides the fit |
| Model match |
Order the stack kit for the exact pump model on the nameplate, including the impeller code after the stage count (for example -2-1 or -2-2): each one is a different kit. |
| Seal and gaskets |
Stack kits do not include the shaft seal or the gasket kit; order them separately (Grundfos price list). |
| Low NPSH |
Where Grundfos lists a Low NPSH stack for the model, it is a separate part number; match the build of your pump. |
| High pressure |
HS and SF high-pressure stacks are for the CRNE and CRN models shown and are not stocked in the U.S. (Grundfos price list). |
Applications
Rebuilding the hydraulic end of Grundfos CR, CRI, CRN vertical multistage pumps (Grundfos price list).
