Product Overview

The Pentair 071725S Shaft Seal is a genuine OEM replacement seal set designed for compatible Pentair C Series and EQ Series commercial pool pumps. Installed between the pump impeller and motor shaft, the mechanical shaft seal creates a watertight barrier that prevents water from escaping the pump wet end and reaching the motor.

A worn or damaged shaft seal commonly causes water to leak from the area between the pump housing and motor. If left uncorrected, this leak may lead to corrosion, damaged motor bearings, electrical problems, and eventual motor failure. Replacing the seal promptly can help protect the motor and restore dependable pump operation.

The 071725S is suitable for servicing compatible Pentair commercial circulation pumps used in swimming pools, spas, water features, aquatic facilities, and other high-flow applications. Genuine Pentair construction provides the correct dimensions, sealing surfaces, and material compatibility required for the intended pump assemblies.

Key Features

• Genuine Pentair OEM replacement seal
• Designed for compatible C Series and EQ Series pumps
• Creates a watertight seal around the motor shaft
• Helps prevent water from entering the pump motor
• Replaces worn, cracked, or leaking mechanical seals
• Suitable for commercial pool and spa pump applications
• Factory-designed for proper fit and alignment
• Helps extend the service life of the motor
• Recommended whenever the impeller is removed
• Includes the mating components required for one shaft-seal replacement

Benefits

• Helps eliminate leaks between the wet end and motor
• Protects motor bearings from water damage
• Restores proper sealing around the rotating shaft
• Reduces the risk of corrosion and premature motor failure
• Allows repair of the pump without replacing the complete assembly
• Genuine OEM fit supports reliable commercial operation
• Ideal for preventative maintenance and pump rebuilding

Specifications

Compatible Applications

The Pentair 071725S is commonly used with compatible models from the following pump families:

• Pentair EQ Series commercial plastic pumps
• Select Pentair C Series commercial pumps
• Pump assemblies requiring a C-7 or PS-360-type seal set
• Commercial pool, spa, fountain, and aquatic circulation systems

Compatibility may vary by pump model, horsepower, manufacturing date, and seal-plate configuration. Verify the original pump model and parts diagram before ordering.

Common Reasons for Replacement

Replace the shaft seal if the pump has:

• Water leaking between the motor and pump housing
• Mineral deposits beneath the motor shaft
• Corrosion around the motor face
• A damaged or cracked ceramic seal surface
• A seal that was removed during pump service
• Leakage after replacing the motor or impeller
• Bearing noise caused by previous water intrusion

A shaft seal should generally not be reused after the impeller has been removed.

Installation Information

Disconnect electrical power and relieve all system pressure before servicing the pump. Drain the wet end, remove the motor assembly, and carefully remove the diffuser and impeller.

Install both halves of the new mechanical seal in the correct orientation. Do not touch the polished ceramic or carbon sealing surfaces with bare fingers. Oils, dirt, scratches, or fingerprints can cause premature leakage.

Inspect the impeller, seal plate, O-rings, motor shaft, and diffuser during installation. Replace any worn components before reassembling the pump. Prime the pump fully and check for leaks after startup.

Professional installation is strongly recommended for commercial pump applications.

Confirm Before Ordering

Please verify:

• Your required part number is 071725S
• Your pump is a compatible Pentair C or EQ Series model
• The motor shaft and seal plate are undamaged
• You require one complete mechanical seal set
• Your pump parts diagram lists 071725S
• The pump will not be operated dry after installation

Warranty Information

This genuine Pentair replacement seal is covered by Pentair’s applicable limited manufacturer warranty against qualifying defects in materials and workmanship. Damage caused by dry operation, improper installation, incorrect orientation, contaminated sealing surfaces, chemical exposure, overheating, or damaged pump components may not be covered.

Customer Q&A

Q: What does the 071725S shaft seal do?
A: It prevents water from leaking along the motor shaft between the pump wet end and motor.

Q: Does it fit Pentair EQ Series pumps?
A: Yes, it is listed for compatible Pentair EQ Series commercial pumps.

Q: Is this a complete pump seal kit?
A: It includes the mechanical shaft-seal set only. Housing and diffuser O-rings are sold separately unless otherwise specified.

Q: Should the seal be replaced when changing the motor?
A: Yes. Installing a new shaft seal is strongly recommended whenever the motor or impeller is removed.

Q: Can the polished seal surfaces be touched?
A: No. Avoid touching the sealing faces because oils and debris may cause immediate leakage.