Pentair
Pentair Sta-Rite System 3 Tank O-Ring 24850-0008Z – for 21" Filters
Pentair Sta-Rite System 3 21" Tank O-Ring
21-inch replacement tank cord O-ring for compatible Pentair Sta-Rite System 3 S7-series cartridge, D.E. and sand filters.
Warranty Information
1-Year Manufacturer Warranty
Ultimate Pools is your first point of contact for compatibility verification, installation guidance, and warranty support.
The Pentair Sta-Rite System 3 21" Tank O-Ring (24850-0008Z), also referenced as alternate SKU 248500008 or 24850-0008, is a replacement cord ring designed for compatible 21-inch System 3 filter tanks. Installed between the upper and lower tank sections, the O-ring provides the sealing surface required at the tank joint.
This replacement cord ring is confirmed for select 21-inch Pentair Sta-Rite System 3 cartridge, D.E. and sand filters, including S7M120, S7M400, S7D75 and S7S50 models. It is black and is intended for replacement when the existing tank O-ring is worn, damaged or otherwise requires replacement.
Key Features
Designed for compatible Pentair Sta-Rite System 3 filters using the 21-inch tank configuration.
Fits between the mating tank sections to provide the required filter tank seal.
Compatible with confirmed System 3 cartridge, D.E. and sand filter models using the 21-inch tank.
Confirmed for S7M120, S7M400, S7D75 and S7S50 filter models.
Part number 24850-0008Z may also be referenced as 248500008 or 24850-0008.
Supplied as a black replacement cord O-ring for the compatible filter tank assembly.
Compatibility & Fitment
Confirmed for the following 21-inch Pentair Sta-Rite System 3 filter models:
- System 3 Modular Media Cartridge Filters: S7M120, S7M400
- System 3 Modular D.E. Filter: S7D75
- System 3 Sand Filter: S7S50
Important: This is the cord ring for the 21-inch filter tank. Larger 25-inch System 3 models use a different cord ring. Compatibility may vary by production year, configuration and installation. Verify your exact model and part number before ordering.
Applications
- System 3 cartridge filter tank O-ring replacement
- System 3 D.E. filter tank O-ring replacement
- System 3 sand filter tank O-ring replacement
- Replacement of worn or damaged 21-inch filter tank cord rings
- Filter servicing requiring separation and resealing of the tank sections
Confirm that your filter uses the 21-inch tank configuration and matches one of the listed compatible models before ordering.
Specifications
| SKU | 24850-0008Z |
| Alternate SKU | 248500008 or 24850-0008 |
| Brand | Pentair |
| Product Type | Filter Tank Cord O-Ring |
| Product Name | 21" Cord O-Ring for Tank Replacement |
| Tank Size | 21" |
| Colour | Black |
| Compatible Series | Pentair Sta-Rite System 3 21" Filters |
| Compatible Models | S7M120, S7M400, S7D75, S7S50 |
| Filter Types | Cartridge, D.E. & Sand |
| Application | System 3 Filter Tank Sealing |
| Warranty | 1-Year Manufacturer Warranty |
| Final Sale | Yes |
Frequently Asked Questions
The 24850-0008Z is confirmed for the 21-inch System 3 S7M120 and S7M400 cartridge filters, S7D75 D.E. filter and S7S50 sand filter.
No. This is the cord ring for compatible 21-inch System 3 filter tanks. Larger 25-inch models use a different cord ring, so verify the filter model before ordering.
Yes. 248500008 and 24850-0008 are an alternate SKUs for part number 24850-0008Z.
The cord O-ring is installed at the joint between the upper and lower filter tank sections to provide the tank seal.
The Pentair Sta-Rite 24850-0008Z carries a 1-year manufacturer warranty and is a final sale item.
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