Pentair Seal Shaft U109-372SS – OEM Replacement Shaft Seal for Pool Pumps
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The Pentair U109‑372SS Shaft Seal is a genuine OEM replacement seal designed to maintain a leak‑free interface between the motor shaft and pump housing in Pentair pool pumps. A precisely engineered shaft seal is critical for preventing water from entering the motor assembly, ensuring efficient operation, reduced wear, and extended pump life.
Constructed from high‑quality materials including corrosion‑resistant stainless steel and durable sealing elastomers, the U109‑372SS delivers dependable performance even under continuous pool use. Whether you’re performing routine maintenance or repairing a leaking pump, this shaft seal restores proper sealing performance and supports optimal pump efficiency.
Pentair U109‑372SS Shaft Seal Compatibility
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Designed for use with various Pentair pool pump models requiring Pentair shaft seal U109‑372SS
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Suitable for both residential and commercial pool pump systems
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Works with Pentair pump assemblies where the original seal has worn or failed
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Compatible with standard mechanical seal housings in many Pentair pump designs
Frequently asked questions
How do I know which O-ring or gasket size I need?
Seals are specified by inside diameter and cross-section thickness, not by the equipment they sit in. Measure the old seal, or use the part number from your equipment's parts diagram, since visually similar rings are frequently a size apart.
What is the part number for this seal?
Pentair lists this seal under part number U109-372SS. Quote U109-372SS when you cross-reference against your equipment manual, an existing part, or a parts diagram, so you are comparing the same revision.
Should I lubricate the seal on installation?
Yes - a thin film of silicone-based pool lubricant helps the seal seat evenly and makes the next service far easier. Do not use petroleum-based grease, which swells and degrades most elastomers used in pool equipment.
How do I confirm this fits my equipment?
Match the part number stamped on the component you are replacing, or look it up in the parts list for your Pentair equipment. If your model or serial number is not named on this page, send it to us before you order and we will confirm the fit.
How often do pool seals need replacing?
Seals are consumables. Replace them whenever the component is opened, and sooner if you see flattening, cracking, a chalky surface or any weeping. A failed seal on the suction side draws air and can make a pump lose prime.
Is there a warranty on this seal?
It carries the standard Pentair manufacturer warranty. The terms are set by Pentair, and on some equipment the coverage only applies when a licensed professional performs the installation. Keep the receipt and packaging until you have confirmed correct operation.