Pentair Centrifugal Pump Shaft Seal U109-433SS

The Pentair U109-433SS Shaft Seal is designed to stop leaks at the source by creating a watertight barrier between the pump’s wet end and motor shaft. This OEM-grade seal resists corrosion and chemical wear in pools. Whether you're repairing a leak or doing preventative maintenance, this seal plays a critical role in protecting your entire pump system. What does the Pentair U109-433SS shaft seal do in a pool pump? The shaft seal prevents water from traveling along the motor shaft and leaking out of the pump housing. It uses a precision-matched ceramic and carbon interface to create a tight seal while still allowing the shaft to spin freely. Choosing a genuine Pentair seal ensures proper fit, durability, and reliable leak protection in high-moisture, chemical-treated environments.