two mechanical seal components including a black rubber and metal ring assembly and a white ceramic ring with rubber gasket
Pentair Pool Products and Parts

Pentair Shaft Seal | U109-372SS

$45.99
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$9.99 flat shipping on orders under $100.
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SKU:
U109-372SS

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About This Item

The Pentair Shaft Seal (U109-372SS) is the OEM replacement shaft seal for Pentair pool and spa pumps, used during motor replacement and routine pump service.

The shaft seal creates the critical barrier between the pump's wet end and the motor, preventing water from contacting the motor bearings. When replacing a pump motor, the shaft seal must always be replaced at the same time — reusing a worn seal on a new motor is a leading cause of premature motor failure.

Specifications

Pentair Part Number U109-372SS
Length 2-1/4 in.
Height 1-3/4 in.
Width 1-3/4 in.
Quantity Each

Poolaroo Pro Tip

Any time you install a replacement motor on a Pentair pump, swap in a fresh shaft seal — never reinstall the existing one. Even a seal that looks intact can have microscopic wear on the mating faces that leads to weeping leaks within weeks of motor startup. Consult your pump's service manual or a qualified pool technician to confirm the correct seal specification for your motor 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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