The US Seal PS-100 Motor Shaft Seal is a precision mechanical seal designed to prevent water leakage between the pump motor and wet end in pool and spa pump applications. This seal forms a critical barrier around the rotating motor shaft, keeping water confined to the pump housing while allowing smooth, consistent operation.

Motor shaft seals operate in one of the harshest environments inside a pool pump. They are exposed to constant pressure, friction, heat, and chemically treated water. Over time, the sealing faces can wear, crack, or lose their ability to maintain a tight seal. When this occurs, water can leak toward the motor, leading to bearing corrosion, electrical damage, and eventual motor failure.

The PS-100 is commonly installed during pump rebuilds, motor replacements, or whenever water is observed leaking from the seam between the motor and pump housing. Replacing a worn shaft seal is essential to restoring proper pump operation and protecting the motor from costly damage.

Why the Motor Shaft Seal Matters

The motor shaft seal protects the most expensive and sensitive component of the pump.

Why this matters:

• Prevents water from entering the motor

• Protects motor bearings from corrosion and failure

• Maintains proper pump pressure and hydraulic efficiency

• Reduces electrical risk caused by moisture intrusion

• Helps extend the overall service life of the pump

A leaking shaft seal is not just a nuisance leak—it is often the first warning sign of a failure that can destroy a motor if left uncorrected.

Designed for Pool & Spa Pump Applications

The US Seal PS-100 is engineered specifically for pool and spa pump environments where continuous run times, temperature fluctuations, and chemical exposure are common. The materials used in the seal are selected to provide reliable sealing performance under normal residential and light commercial operating conditions.

US Seal is a trusted manufacturer of pump sealing components, known for consistent sizing and dependable construction. The PS-100 meets common dimensional standards used by many pump manufacturers, making it a widely used replacement seal across multiple pump models.

Always confirm seal compatibility with your specific pump and motor before installation.

Service-Ready Installation

The PS-100 motor shaft seal is typically replaced anytime a pump motor is removed, rebuilt, or replaced. Proper installation is critical to seal performance and longevity.

Best installation practices include:

• Thoroughly cleaning all seal surfaces

• Avoiding contact with seal faces using bare fingers

• Installing seal components squarely and evenly

• Following manufacturer torque and assembly specifications

Replacing the shaft seal during motor service helps prevent repeat labor and ensures the pump is fully protected once returned to operation.

Product Specifications

Buy with Confidence from Benchmark Pool Supply

When you purchase the US Seal PS-100 Motor Shaft Seal from Benchmark Pool Supply, you’re getting a dependable replacement component trusted by pool service professionals. We stock essential pump repair parts to help protect motors, restore performance, and keep pool systems operating reliably.

Benchmark Pool Supply is your trusted source for professional-grade pool equipment parts and maintenance supplies.