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The U.S. Seal Mfg. PS-3960 Pump Shaft Seal is a 5/8 Inch Buna and carbon mechanical seal designed as a direct replacement for the Hayward SPX2700SA shaft seal used in MaxFlo II, MaxFlo XL, MaxFlo VS, and compatible booster pump models. This seal features a carbon rotating face paired with a ceramic stationary seat to help maintain a consistent seal around the pump shaft and prevent water leakage into the motor. The Buna elastomer provides flexibility and chemical resistance, supporting reliable sealing performance in pool and spa environments. While commonly used in spa and lower-pressure applications, the PS-3960 performs effectively when installed within proper pump tolerances. Replacing a worn shaft seal helps protect the pump motor, preserve wet-end integrity, and reduce leak-related failures.
Highlights
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Direct Replacement for SPX2700SA: Designed to match the size and function of the Hayward SPX2700SA mechanical seal for proper interchangeability.
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Carbon and Ceramic Sealing Faces: Carbon rotating surface works against a hard ceramic seat to maintain a smooth, stable seal during operation.
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Buna Elastomer Construction: Flexible Buna rubber helps accommodate movement while resisting pool and spa water chemistry.
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Leak Prevention Component: Seals the pump shaft opening to reduce water intrusion that can damage bearings and motors.
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Service-Friendly Installation: Straightforward mechanical seal replacement supports routine pump maintenance and wet-end repairs.
Compatibility
- Hayward MaxFlo II Pumps
- Hayward MaxFlo XL Pumps
- Hayward MaxFlo VS Pumps
Note: This part may be compatible with your system, please refer to your owners manual to ensure compatibility.
Additional Info
The U.S. Seal Mfg. PS-3960 Shaft Seal is a mechanical pump seal used to prevent leaks along the motor shaft in compatible Hayward pumps. This FAQ addresses compatibility, installation planning, and service-related questions. It is intended to help confirm correct usage before replacing the seal.
Compatibility and System Fit
Mechanical shaft seals must match the pump shaft size and wet-end design exactly. The PS-3960 is designed for specific Hayward systems.
Which pump platforms use the PS-3960 shaft seal?
The PS-3960 replaces the Hayward SPX2700SA seal found in MaxFlo II, MaxFlo XL, MaxFlo VS, and select booster pumps. These platforms use a 5/8 inch shaft seal design. Local service professionals often replace this seal when addressing motor-side leaks.
Is the PS-3960 suitable for older MaxFlo pump designs?
Compatibility depends on whether the pump uses the SPX2700SA-style seal. Pump age alone does not determine fitment. Before calling your nearest location, confirming the pump model helps determine suitability.
Can the PS-3960 be used with aftermarket impellers?
Yes, as long as the impeller and seal cavity dimensions match the original design. Proper alignment is critical for sealing. Checking nearby shop stock helps with service planning.
Installation and Service Planning
Replacing the shaft seal helps prevent ongoing leaks and motor damage. Planning the service avoids unnecessary downtime.
How long does it take to replace a shaft seal?
Seal replacement typically occurs during a standard wet-end service. Time depends on access and condition of fasteners. Local service professionals often inspect bearings and gaskets at the same time.
Does the PS-3960 handle normal pool operating conditions?
The PS-3960 is built with Buna elastomer and carbon sealing surfaces suitable for many pool and spa environments. It performs best in lower-pressure applications. Compare pricing across stores when planning maintenance parts.
Should the pump be tested after seal replacement?
Yes, running the pump briefly after reassembly allows inspection for leaks. Observing the seal area confirms proper installation. This helps prevent repeat service calls.
Local Pricing and Availability
Knowing availability helps coordinate repairs efficiently. Local access supports faster turnaround.
Is the PS-3960 available from nearby shop stock?
Availability varies by location, so checking nearby shop stock before scheduling service is recommended. Having the part number ready speeds up confirmation. This helps avoid delays.
Do service professionals commonly stock this seal?
Many local service professionals keep common MaxFlo shaft seals on hand due to frequent wear. The PS-3960 is widely used. Checking local pricing helps with inventory planning.
Can staff help confirm the correct shaft seal before service?
Yes, staff can review pump model details and seal specifications. Before calling your nearest location, having photos or the old seal available helps ensure accuracy.
Questions & Answers
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