Pentair U-3 Skimmer Extension Collar | WC37-503P
Pentair U-3 Skimmer Extension Collar | WC37-503P

Pentair Skimmer Extension Collar | U-3 Skimmer | WC37-503P

Regular price$42.99
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SKU:
WC37-503P
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About This Item

The Pentair Skimmer Extension Collar (WC37-503P) is the OEM replacement collar for the Pentair U-3 Skimmer series, designed specifically for vinyl liner pool installations.

The extension collar raises the skimmer body to the correct height relative to the vinyl liner surface, ensuring the weir door operates at the proper water level and the skimmer face plate seats flush against the liner. When the collar is cracked, warped, or missing, the skimmer throat can sit out of alignment with the liner — compromising the seal and reducing surface skimming performance. Replacing it with the correct OEM part restores the proper geometry of the assembly.

Specifications

Pentair Part Number WC37-503P
Part Name Skimmer Extension Collar
Application Vinyl liner pools only
Quantity Included 1 (Each)

Fits Into

Brand Equipment Line Model / Part Number Notes
Pentair U-3 Skimmer 09655-2403 For use on Vinyl Liner Skimmers. Verify fitment before ordering.
Pentair U-3 Skimmer 09655-2404 For use on Vinyl Liner Skimmers. Verify fitment before ordering.
Pentair U-3 Skimmer 09655-1403 For use on Vinyl Liner Skimmers. Verify fitment before ordering.
Pentair U-3 Skimmer 09655-1404 For use on Vinyl Liner Skimmers. Verify fitment before ordering.

Compatibility is based on Pentair parts documentation and available OEM records. This is not an exhaustive list. For certainty, verify the part number in your equipment's manual or on the original part itself before ordering.

Pro Tip

This collar is specified for vinyl liner installations only — it is not the correct component for concrete or fiberglass skimmer applications. Before ordering, locate the model number stamped on the inside of your skimmer body and confirm it matches one of the U-3 series models listed above. If your U-3 skimmer is showing signs of liner pull or weir door misalignment, inspect the collar for stress cracks along the mounting flange — that is the most common failure point on this component.

CALIFORNIA PROPOSITION 65 WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.
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Pentair Pool Products and Parts

About Pentair Pool Products and Parts

Pentair is often considered the "gold standard" for pool professionals, and for good reason. Founded in 1966 (originally by five inventors making high-altitude balloons!), the company has evolved into the global leader in smart, sustainable water solutions. For the DIY homeowner, Pentair represents the intersection of rugged durability and silicon valley-tier technology. They pioneered the Variable Speed Pump revolution with the IntelliFlo®, saving American pool owners millions in energy costs. Today, their ecosystem focuses heavily on automation, allowing you to control your pump, heater, lights, and chemistry from a single app. While they are a favorite among professional builders, their "EC" (E-Commerce) line of equipment allows homeowners to access pro-grade technology with valid warranties for DIY installation.

Why We Trust Pentair Pool Products and Parts
Energy Efficiency Leaders: Recipient of the ENERGY STAR® Partner of the Year award for over a decade; their pumps are designed to pay for themselves in energy savings.

Smart Automation: The Pentair Home App and IntelliCenter systems offer best-in-class control over your pool ecosystem from anywhere in the world.

Professional Pedigree: The brand most often recommended and installed by pool builders for high-end residential pools.

Eco-Conscious: Dedicated to reducing water waste and energy consumption through "Green" technology innovations.

More about Genuine Pentair Pool Parts

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