Pump Body, PB4SQ – Polaris Booster Pump Replacement Housing

Restore Your Polaris Booster Pump with the PB4SQ Pump Body Replacement

When your Polaris booster pump housing cracks, leaks, or wears out, there’s no need to replace the entire pump. You can restore it to like-new condition with the Pump Body, PB4SQ — a genuine OEM replacement housing made specifically for the Polaris PB4SQ Booster Pump.

This OEM-quality replacement is precision-engineered by Polaris for a perfect fit, durable performance, and quiet operation. If your pump housing has freeze damage, corrosion, or warping, replacing it restores your booster system to top condition — saving you both time and money compared to replacing the entire pump.

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Designed for the Polaris PB4SQ Booster Pump

The Polaris PB4SQ (Quiet Series) is one of the most efficient and quiet booster pumps in the industry. The PB4SQ Pump Body directly replaces the original housing while maintaining the same hydraulic performance, pressure ratings, and low-noise operation that Polaris is known for.

This molded housing forms the base of your pump’s water pathway. It holds the impeller and seal plate that generate pressure for your Polaris pressure-side cleaner. Replacing a damaged housing restores full cleaning pressure and prevents leaks that could damage the motor, bearings, or impeller assembly.

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Built from High-Strength, Corrosion-Resistant Materials

Polaris constructs the PB4SQ pump body with reinforced thermoplastic polymers that resist corrosion, chlorine damage, and UV exposure. These materials stand up to years of pool water chemistry and outdoor heat without cracking or deforming.

Unlike generic aftermarket imitations, this OEM housing is pressure-rated and engineered with tight tolerances, ensuring a precise seal with O-rings, diffusers, and impellers. That accuracy ensures your PB4SQ pump maintains efficient water flow and consistent pressure — key to the reliable performance of Polaris pressure cleaners like the 280, 380, and 3900 Sport.

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Quiet, Efficient Design for Modern Pool Systems

Part of Polaris’ “Quiet Series,” the PB4SQ was designed to deliver strong performance with minimal noise. The pump body’s internal water channels reduce turbulence and vibration, allowing for smooth water flow and whisper-quiet operation.

Installing a genuine PB4SQ housing ensures that your booster pump retains its quiet performance — making your pool environment more relaxing and energy-efficient.

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Perfect Fit, Hassle-Free Installation

The PB4SQ Pump Body is built to OEM specifications, guaranteeing compatibility with your existing pump components. All mounting holes, ports, and seals align perfectly for a fast, no-hassle installation.

To replace a cracked or leaking housing, simply transfer your motor, impeller, and fittings from the old body to the new one. You’ll restore your pump’s full performance, pressure, and flow without the cost of a complete system replacement.

If you need a full rebuild, check out our Polaris PB4SQ Booster Pump Parts Collection for compatible seal kits, impellers, and motors.

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Protects Against Leaks and Damage

Cracks, leaks, and seal failures can cause air leaks, water loss, and motor damage. Replacing the housing early prevents secondary failures in:

• Impeller shaft seals

• Motor bearings

• Pump unions and fittings

A new PB4SQ housing keeps your booster pump fully sealed and pressure-stable, ensuring reliable performance for your Polaris pool cleaner.

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Key Features

• Genuine Polaris replacement housing for the PB4SQ booster pump

• Reinforced thermoplastic construction resists corrosion and UV damage

• Precision OEM fit for seamless installation

• Restores proper pressure and water flow for efficient cleaning

• Maintains the PB4SQ’s quiet performance and energy efficiency

• Leak-resistant design with molded sealing surfaces

• Compatible with standard Polaris parts and fittings

• Factory-tested to Polaris manufacturing standards

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Installation Tips

1. Turn off power and relieve system pressure before disassembly.

2. Disconnect pump unions and remove the old housing.

3. Separate the motor assembly and impeller from the damaged body.

4. Inspect O-rings and seals — replace as needed for watertight integrity.

5. Reassemble using the new PB4SQ housing and Polaris seal kit.

6. Prime the system and test for leaks before normal operation.

For best results, always use Polaris seal and O-ring kits with your new housing.

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Common Signs It’s Time to Replace the Pump Body

• Visible cracks or leaks on the housing

• Loss of pressure or water spray under the pump

• Air intrusion or cavitation noise

• Warping or corrosion from chemicals

• Excessive vibration or motor misalignment

Replacing the pump body early prevents costly repairs to your impeller, seals, and motor — and keeps your cleaner operating at full strength.

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Compatibility

• Fits: Polaris PB4SQ Booster Pump

• Compatible Cleaners: Polaris 280, 380, 3900 Sport, and TR35P

• Not Compatible With: PB4-60 or PB460 models (different housing design)

If you’re unsure which model you own, see our Polaris Booster Pump Comparison Guide or contact Benchmark Pool Supply for expert help.

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Product Specifications

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Who It’s For

• Homeowners repairing a cracked or leaking Polaris PB4SQ housing

• Pool service professionals handling PB4SQ replacements

• Technicians performing full motor rebuilds

• DIY pool owners comfortable with pump disassembly

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Why Buy from Benchmark Pool Supply

At Benchmark Pool Supply, we specialize in genuine OEM parts like the Polaris PB4SQ Pump Body — ensuring long-term durability, compatibility, and performance.

We provide:

• 100% authentic Polaris components

• Expert advice from real pool professionals

• Fast, local shipping from Fresno and Clovis

• Responsive support for installation questions

Shop with confidence knowing every part is backed by manufacturer quality and our commitment to customer satisfaction.

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Frequently Asked Questions

Is this an original Polaris part?
Yes. The PB4SQ Pump Body is a genuine OEM replacement for the Polaris PB4SQ Booster Pump.

Does it include the impeller or motor?
No. This listing is for the pump body housing only. You can find the Polaris PB4SQ Impeller and PB4SQ Seal Kit in our parts collection.

Can I use this on the PB4-60 or PB460 pumps?
No. The PB4SQ housing has a unique shape and configuration exclusive to the PB4SQ Quiet Series.

What causes pump bodies to crack?
Common causes include freeze damage, chemical exposure, overtightened fittings, or prolonged UV exposure.

Is installation complicated?
Not at all. Most DIY pool owners can handle replacement using standard tools.

Do I need new O-rings or seals?
Yes, replacing the seal kit ensures proper sealing and prevents future leaks.

Will this fix low pressure issues?
If your old housing was cracked or leaking, replacing it with the PB4SQ pump body will restore full water pressure and flow.