The Pentair Sta-Rite System 3 Lower Bulkhead & Elbow Fitting (25021-0100) is a Filter Bulkhead Replacement. This allows for proper flow throughout the Filter Cartridge and back to your pool system. Fits the Pentair Sta-Rite models S7M120, S7M400, S8M150, S8M500, S7D75, S8D110, S8S70, S7S50, PTM50, PTM70, and PTM100.


  • Bulkhead & Elbow Fitting Replacement.
  • Lower Bulkhead Only.
  • Plastic Construction.