Pentair Challenger Diffuser O-Ring | 355331Z
Pentair
SKU: 355331Z
Pentair 355331Z Diffuser O-Ring
Part Number: 355331Z
Description
Genuine Pentair diffuser O-ring designed to seal the diffuser component of select Pentair pool pumps, preventing leaks and maintaining optimal performance of the pump's hydraulic path.
Compatibility & Fitment
- Designed for Pentair Challenger High Flow and High Pressure inground pump models.
- Also fits the Pentair WaterFall specialty pump series.
- Recommended for use when the diffuser is removed for service or when you observe seepage or loss of pressure at the diffuser joint.
Features & Specifications
- Precision molded sealing ring sized for the diffuser groove (approximately 3″ inside diameter, ¼″ cross-section).
- Constructed of pool-rated elastomeric material compatible with chlorinated and saltwater environments.
- OEM Pentair part ensuring correct fit and performance versus generic substitutes.
Installation Notes
Shut off power to the pump and relieve system pressure. Remove the pump housing and extract the diffuser. Remove the old O-ring, clean the groove and diffuser surface, install the 355331Z O-ring ensuring it sits flat and undamaged, re-install the diffuser and secure per manufacturer torque specifications. After restart, monitor the pump for any signs of leakage or loss of prime.
Maintenance Tip
Inspect the diffuser O-ring during routine pump service (e.g., housing re-assembly or annual inspection). If the O-ring appears flattened, cracked or shows signs of chemical degradation, replace it with the 355331Z to ensure long-term sealing integrity and avoid costly pump or system damage.
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.
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