Pentair 355334Z Stainless Steel Hex Washer Head Screw (Diffuser Screw, #8-32 x 1") The Pentair 355334Z is an OEM stainless steel hex washer head screw commonly used to secure the diffuser on select Pentair and Sta-Rite pool pump wet ends. If your diffuser screw is stripped, corroded, or missing, replacing it helps keep the diffuser properly seated for correct water flow and stable pump performance. Key Details Type: Hex washer head screw Material: Stainless steel Thread size: #8-32 Length: 1 inch Typical quantity used: Often 3 required (varies by pump model) Common name: Diffuser screw Common Applications (Verify by Pump Model) Pentair Challenger High Flow and Challenger High Pressure pumps Pentair SuperFlo and SuperFlo VS pumps Pentair Pinnacle high flow pumps Sta-Rite SuperMax and SuperMax VS pumps Select Pentair Waterfall specialty pumps When to Replace Screw head is rounded/stripped and can’t be tightened properly Threads are damaged or the screw will not hold torque Corrosion or staining that makes future service difficult Diffuser was removed for service and hardware is worn Installation Notes Turn off power at the breaker and relieve system pressure before opening the pump. Start each screw by hand to avoid cross-threading. Tighten evenly (do not over-tighten) to avoid cracking plastic diffuser/threads. If threads in the plastic are damaged, inspect the diffuser and housing for repair/replacement needs. Related Products (Aqua Pool Supply) Pentair Challenger Diffuser O-Ring 355331 (Search) Pentair Challenger Seal Plate O-Ring 355329Z (Search) Pentair Challenger Strainer Pot / Housing O-Ring 355330 (Search) Pentair Challenger Shaft Seal Kits (Search) Maintenance Tips When servicing the wet end, inspect diffuser O-rings and sealing surfaces—air leaks and poor priming often start there. Keep hardware clean and dry at the equipment pad; rinse off chemical splash and salt mist where applicable. If you frequently open the pump, consider keeping a small set of replacement screws on hand to prevent downtime.
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