System 3 Tank O-Ring
The System 3 Tank O-Ring made by Pentair is a Direct OEM Replacement. The cord O-Ring fits the Sta-Rite System 3 Modular Media SM series pool and spa cartridge filter model S7M120 and S7M400.
- 21″ Diameter and made for 21″ tanks
- Compatible with Sta-Rite System 3 SD series pool and spa D.E. filter model S7D75.
- This item is made by Sta-Rite / Pentair and is NOT Generic.
- Don’t be fooled by cheap o-rings that won’t last!!