Pentair 355030Z – High-Flow Diffuser O-Ring (Square Cross-Section)
Product Overview
This OEM diffuser O-ring is designed for high-flow pump models and fits select Pentair and Sta-Rite inground pool pumps. It features a square cross-section seal designed for durability under high flow and pressure conditions.
Key Features
- Square cross-section O-ring — thicker profile for enhanced sealing under high flow.
- Fits major pump models including Challenger®, Pinnacle High Flow, SuperFlo®, SuperMax® and others.
- Essential replacement part to restore the diffuser seal and prevent leakage or performance loss.
- Durable elastomer material selected for chemical resistance and long life in pool environments.
Technical Specifications
- Part Number: 355030Z
- Approximate Dimensions: Outside Diameter ~3-1/8″, Inside Diameter ~2-3/4″, Cross Section ~3/16″ thick
- Shape: Square cross-section “ring” style (not a standard round O-ring)
- Compatible with: Select Pentair/Sta-Rite high-flow inground pump models
Installation & Fit-Up Notes
- Turn off power to the pump and relieve system pressure before servicing.
- Remove the pump wet-end or diffuser assembly to access the existing O-ring.
- Clean both mating surfaces thoroughly to ensure the new O-ring seats properly.
- Install the 355030Z O-ring in its groove, ensuring no twists or kinks.
- Re-assemble the diffuser and pump housing, restore power, and check for leaks and proper flow.
Troubleshooting & Maintenance Tips
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Leak between diffuser and housing: Confirm the O-ring is fully seated, and mating surfaces are clean and undamaged.
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Reduced pump flow or pressure fluctuations: A degraded or missing diffuser seal can cause bypass or inefficient flow—replace the O-ring if worn.
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O-ring deformation or chemical damage: Inspect annually; replace at first signs of flattening, cracking or chemical swelling.
Maintenance Tip
During pump service or annual inspection, remove and inspect this O-ring. If the seal shows wear or the pump is reassembled, replacing the diffuser O-ring proactively can prevent leaks and prolong the life of your pump’s hydraulic system.
