A leaking booster pump is more than an inconvenience—it’s a sign of internal seal failure that can quickly lead to motor damage if ignored. The Polaris R0747800 PB4SQ Mechanical Seal is a genuine OEM replacement designed specifically to restore a watertight seal inside Polaris PB4SQ booster pumps, protecting the motor and extending pump life.

Mechanical seals are wear items by design. Over time, heat, pressure, and chemical exposure cause seals to degrade, allowing water to escape along the pump shaft. Replacing the seal at the first sign of leakage is one of the most cost-effective ways to prevent a complete pump failure.

Stops Shaft Leaks and Protects the Motor

The mechanical seal is the primary barrier that prevents water from traveling along the motor shaft. When it fails, leaks typically appear between the pump housing and motor—often mistaken for housing cracks or gasket issues.

Installing the Polaris R0747800 mechanical seal:

• Stops water leaks at the motor shaft

• Prevents corrosion and bearing damage

• Protects the motor from premature failure

• Restores proper pump operation

Addressing seal leaks early can save hundreds of dollars in motor or pump replacement costs.

Designed Specifically for Polaris PB4SQ Booster Pumps

This seal is engineered to match the exact shaft size, tolerances, and operating conditions of the Polaris PB4SQ booster pump. Using the correct OEM seal ensures:

• Proper spring tension

• Correct ceramic and carbon face alignment

• Long-term leak prevention

• Reliable performance under pressure

Generic seals often fail prematurely due to improper fit or material mismatch.

Genuine Polaris OEM Quality

As a genuine Polaris replacement part, the R0747800 seal is manufactured to factory specifications using pump-grade materials designed to withstand:

• Continuous water exposure

• Chlorine and pool chemicals

• Heat generated during pump operation

• High-speed shaft rotation

OEM quality matters when dealing with critical internal pump components.

Recommended During Pump Service or Rebuilds

Most technicians replace the mechanical seal anytime a PB4SQ pump is opened for service. It’s also commonly replaced during:

• Motor replacements

• Seal plate or impeller service

• Recurrent or slow-developing leaks

Replacing the seal proactively helps ensure long-term reliability after reassembly.

Product Specifications

Why Pool Owners & Pros Choose the Polaris R0747800 Seal

• Stops leaks before motor damage occurs

• Designed specifically for PB4SQ pumps

• Genuine OEM Polaris quality

• Essential for pump rebuilds and repairs

• Extends pump and motor lifespan

• Cost-effective preventative maintenance

If your PB4SQ booster pump is leaking—or being serviced—this seal is a must-replace component.

Buy with Confidence from Benchmark Pool Supply

When you purchase the Polaris R0747800 PB4SQ Mechanical Seal from Benchmark Pool Supply, you’re buying from pool professionals who understand pump failures, seal wear, and proper repair practices.

We stock genuine Polaris parts and help customers keep their equipment running reliably with the right components—not guesswork.