Pentair Sta-Rite System:3 21″ S7S50 Sand Conversion Kit | 25021-2021
OEM Pentair Sta-Rite 21″ sand conversion kit for System:3 SS-Series S7S50 filters. Includes O-ring, drain, tank fitting, and 1-1/2″ NPT plug.
Features
- Genuine Pentair replacement conversion kit for Sta-Rite System:3 SS-Series filters.
- Built specifically for 21″ model S7S50 applications.
- Includes O-ring, sand removal 1-1/2″ NPT plug, drain, and tank fitting.
- Direct OEM replacement kit for older System:3 sand filter service.
- Collector assembly is not included and must be purchased separately.
The Pentair 25021-2021 S7S50 Sand Conversion Kit is the correct OEM conversion kit for Sta-Rite System:3 SS-Series 21″ sand filter model S7S50. It includes the core replacement parts needed for the conversion setup, including the O-ring, sand removal 1-1/2″ NPT plug, drain, and tank fitting. This is not a universal kit, and it is not complete without the separate collector assembly Pentair calls out in its parts documentation. If you are rebuilding or converting an older S7S50 system, this is the right kit to start with.
Pro Tip
Verify the filter model tag before ordering and confirm whether the collector assembly is still present and usable. Pentair specifically notes that the collector assembly must be purchased separately for this conversion.
Installation Tips
Shut the system down fully and relieve all pressure before service. Confirm the filter is a Sta-Rite System:3 SS-Series S7S50, inspect the collector assembly separately, and replace worn sealing parts during reassembly to avoid repeat teardown.
