Call For Best Price 1-888-484-0864

Pentair Challenger Diffuser Screw #8 Hex Washer Head | 355334Z

Pentair SKU: 355334Z

Pentair Challenger Diffuser Screw #8 Hex Washer Head | 355334Z

Pentair SKU: 355334Z
  • In stock, ready to ship
  • Inventory on the way
$7.75
Instant Savings: $5.24
/
🚚 Shipping notice loading...
Questions about returns? View our return policy.
Free US Shipping - Shipping Policy

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)

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.
Questions about returns? View our return policy.

Hours Of Operation:

Monday - Friday: 7:00 am to 5:00 pm Phoenix Time

Saturday: 8:00 am to 2:00 pm

Sunday: Closed

  • We do not ship on Saturday or Sunday.
  • Orders totaling more than $300 will require signature confirmation upon delivery.
  • We process and prepare orders for shipment within 1 business day. Please note that many other pool supply retailers require 3–5 days of handling time before shipping.
  • Orders placed after 1:00 pm Phoenix Time may not be eligible for same-day shipment.
  • Expedited shipping options are available at checkout.

Return Policy:

  • Products that are received damaged will receive a refund in store credit.
  • Most products are eligible for return within 30 days of receipt, except where noted below.
  • To initiate a return, please complete an RMA form prior to sending your item back.
  • Original shipping costs are non-refundable and will be deducted from the return credit.
  • Items returned missing accessories or original packaging, or that are not in the same condition as received, may be subject to a restocking fee of up to 100% depending on the condition of the item upon return.
  • Some returns will be charged an automatic 15% restocking fee.
  • We are unable to issue refunds for items that have been damaged or rendered inoperable due to installer error.
  • Please complete the return form to receive your RMA number and return shipping label.
  • Chemical products are not eligible for return under any circumstances.
  • The Pentair Colorsync 618031 is not eligible for return.
  • Pool cleaners are not eligible for return.
  • Opened seals and o-rings are not eligible for return.
  • Capacitors are not eligible for return.
  • Plastic popup tools are not eligible for return.
  • Automation components and circuit boards are not eligible for return.
  • If a light is returned due to a reported malfunction and is found to be fully operational upon testing, return shipping costs and a restocking fee will be deducted from the refund.
  • Orders refused at the time of delivery will be subject to the original shipping costs being deducted from the refund.
Related Products