The Polaris PB4SQ Booster Pump O-ring Set with Seal (R0734300) is a genuine OEM service kit designed to restore proper sealing, internal pressure, and leak-free operation in Polaris PB4SQ booster pumps. This kit includes the essential O-rings and shaft seal required to protect the pump’s internal components and maintain reliable performance when powering pressure-side pool cleaners.

Booster pumps operate in a demanding environment where constant water pressure, heat, and chemical exposure gradually break down rubber sealing components. As seals age, they can harden, flatten, or crack, allowing water to escape from the pump housing or migrate toward the motor bearings. Even small leaks can quickly lead to reduced cleaner performance, air intrusion, corrosion, and premature pump failure.

Replacing worn O-rings and shaft seals is a critical part of proper PB4SQ maintenance and should be performed anytime leaks are present, the motor is serviced, or the pump is disassembled. This OEM kit ensures correct fit, proper material compatibility, and long-term reliability under continuous booster pump operation.

Why the Seal & O-rings Matter

Seals are one of the most critical components inside a booster pump.

Why this matters:

• Prevents water leaks at the motor shaft and housing joints

• Maintains consistent operating pressure to pressure-side pool cleaners

• Protects motor bearings from water intrusion and corrosion

• Reduces strain on internal components caused by air leaks

• Helps extend the overall service life of the booster pump

A compromised seal does not just cause leaks—it can lead to loss of cleaner performance, increased electrical load, and costly motor damage if left unaddressed.

Designed for Polaris PB4SQ Booster Pumps

This O-ring and seal kit is manufactured to Polaris OEM specifications and is designed exclusively for Polaris PB4SQ booster pump models. The materials and tolerances are engineered to withstand the constant pressure cycles and operating temperatures common in booster pump applications.

Unlike aftermarket alternatives, OEM Polaris seals are designed to seat properly within the pump housing and shaft assembly, ensuring correct compression and long-term durability. Improperly fitting seals can fail prematurely or allow slow leaks that go unnoticed until internal damage occurs.

This kit installs directly with no modification and is intended only for PB4SQ models.

Service-Ready Installation for Maintenance & Repairs

The Polaris PB4SQ seal and O-ring kit is commonly installed during routine service, pump rebuilds, or motor replacements. Replacing seals during scheduled maintenance helps prevent repeat labor and unexpected equipment downtime.

This kit is ideal for pool service professionals as well as experienced DIY repairs. Proper installation using manufacturer-recommended procedures ensures reliable sealing and optimal pump performance after service.

Always follow Polaris service guidelines and lubrication recommendations when installing new seals and O-rings.

Product Specifications

Buy with Confidence from Benchmark Pool Supply

When you purchase the Polaris PB4SQ Booster Pump O-ring Set with Seal from Benchmark Pool Supply, you’re getting a genuine OEM replacement part trusted by pool service professionals and equipment installers. We stock critical repair components to help keep pressure-side cleaning systems operating efficiently and reliably.

Our team understands the importance of proper sealing in high-pressure booster pumps, and we carry OEM parts to ensure long-term performance and dependable repairs.

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