Pentair BioShield Seal Kit (Previous) for BioShield UV System 50W–150W | 523031
Pentair Pool Products and Parts

Pentair BioShield Seal Kit (Previous) for BioShield UV System 50W–150W | 523031

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SKU:
523031

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About This Item

The Pentair BioShield Seal Kit (523031) is the OEM replacement o-ring seal kit for the previous-generation BioShield UV system, covering all High-Output wattage variants from 50W through 150W.

⚠️ IMPORTANT: KIT LISTING
This listing is a kit, not a single seal. One kit services a complete BioShield UV unit.

⚠️ IMPORTANT: PREVIOUS GENERATION SYSTEMS ONLY
Part 523031 is designed for previous-generation BioShield UV systems. Confirm your BioShield unit is a previous-generation model before ordering. If you are unsure of your system's generation, verify the part number against the label on your existing unit or your equipment's installation manual.

The seal kit provides the seals required to service the wetted connections on a BioShield UV system. UV system seals are exposed to continuous water flow and UV radiation, which degrade elastomers over time. Replacing the full seal kit during lamp or quartz sleeve service prevents water intrusion into the lamp housing and maintains the system's sanitization effectiveness.

Specifications

Pentair Part Number 523031
Part Name BioShield Seal Kit (Previous Generation)
Unit of Measure Kit
Compatible Systems BioShield UV System — previous generation; 50W, 80W, 120W, and 150W models

Fits Into

Brand Equipment Line Model / Part Number Notes
Pentair BioShield UV System 50 Watt 522635 Previous generation seal kit; fits all BioShield High-Output wattage variants
Pentair BioShield UV System 80 Watt 522636 Previous generation seal kit; fits all BioShield High-Output wattage variants
Pentair BioShield UV System 120 Watt 522637 Previous generation seal kit; fits all BioShield High-Output wattage variants
Pentair BioShield UV System 150 Watt 522638 Previous generation seal kit; fits all BioShield High-Output wattage variants

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

Replace the full seal kit any time you remove the BioShield lamp or quartz sleeve for service — even if the existing seals appear undamaged. UV exposure and thermal cycling cause elastomer hardening that isn't always visible, and a failed seal during reassembly means draining and reopening the unit. Confirm your BioShield unit is a previous-generation model by checking the model number on the unit's label against the Fits Into table above before ordering.

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.

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