Pentair Style 1 Cleaning Head Square O-Ring 236950 516664
Pentair
SKU: 516664
Pentair 236950 / A&A 516664 Style 1 Cleaning Head Square O-Ring
The Pentair 236950 Square O-Ring, formerly A&A part number 516664, is a genuine replacement seal for Style 1 in-floor cleaning heads. This square-profile O-ring helps seal the internal cleaning head assembly and supports proper pop-up operation in compatible Pentair/A&A in-floor pool cleaning systems.
This replacement O-ring is commonly used when the existing seal is worn, flattened, stretched, leaking, cracked, or damaged during cleaning head service. A properly seated square O-ring helps maintain pressure at the cleaning head and supports reliable in-floor cleaning performance.
Product Features
- Genuine Pentair / A&A in-floor cleaning replacement part
- Current Pentair part number: 236950
- Legacy A&A part number: 516664
- Square-profile O-ring for Style 1 cleaning heads
- Helps seal the cleaning head internal assembly
- Supports proper pop-up head pressure and operation
- Ideal for replacing a worn, leaking, flattened, or damaged O-ring
Product Details
| Brand | Pentair / A&A |
| Current Part Number | 236950 |
| Legacy Part Number | 516664 |
| Product Type | Cleaning Head O-Ring |
| Profile | Square |
| Cleaning Head Style | Style 1 |
| Application | In-floor pool cleaning head seal replacement |
Compatibility
- Pentair/A&A Style 1 in-floor cleaning heads
- Style 1 High Flow internal applications
- Style 1 Low Flow internal applications
- Compatible in-floor cleaning systems requiring Pentair 236950 or A&A 516664
Common Uses
- Replacing a worn cleaning head O-ring
- Servicing Style 1 pop-up cleaning heads
- Helping correct pressure loss at an in-floor cleaning head
- Replacing an O-ring that is cracked, stretched, flattened, or missing
- Routine maintenance during cleaning head removal or internal replacement
Important Notes
- This item is the square O-ring only.
- Cleaning head internal, floor fitting, collar, and removal tool are sold separately unless otherwise stated.
- This is a square-profile O-ring and should not be replaced with a standard round O-ring.
- Verify your cleaning head style before ordering.
- Style 1, Style 2, G2, G2V, G3, and G4 cleaning head parts are not always interchangeable.
Installation Notes
- Turn off the pool pump before removing or servicing an in-floor cleaning head.
- Use the correct removal tool for the cleaning head style when required.
- Remove the old O-ring and clean the O-ring groove before installing the replacement.
- Inspect the cleaning head internal and floor fitting for cracks, debris, or wear.
- Apply a light coating of pool-safe silicone lubricant if needed.
- Do not use petroleum-based lubricants, as they can damage rubber O-rings.
- After installation, restart the system and confirm the cleaning head cycles and pops up correctly.
Maintenance Tips
- Inspect the O-ring whenever the cleaning head is removed for service.
- Replace the O-ring if it appears flattened, brittle, cracked, stretched, or damaged.
- Keep the floor fitting and cleaning head free of debris to help prevent sticking or poor rotation.
- Maintain proper filter pressure and clean the filter regularly to support in-floor system performance.
- Maintain proper water chemistry to help reduce scale buildup on moving parts and seals.
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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