John Crane Type 21 Replacement Mechanical Seal, T21-1/2″-3 1/4″ Elastomer Bellows Water Pump Shaft Seal
John Crane Type 21 Replacement Mechanical Seal, T21-1/2″-3 1/4″ Elastomer Bellows Water Pump Shaft Seal
John Crane Type 21 Replacement Mechanical Seal, T21-1/2″-3 1/4″ Elastomer Bellows Water Pump Shaft Seal
John Crane Type 21 Replacement Mechanical Seal, T21-1/2″-3 1/4″ Elastomer Bellows Water Pump Shaft Seal
John Crane Type 21 Replacement Mechanical Seal, T21-1/2″-3 1/4″ Elastomer Bellows Water Pump Shaft Seal
John Crane Type 21 Replacement Mechanical Seal, T21-1/2″-3 1/4″ Elastomer Bellows Water Pump Shaft Seal
  1. John Crane Type 21 Replacement Mechanical Seal, T21-1/2″-3 1/4″ Elastomer Bellows Water Pump Shaft Seal
  2. John Crane Type 21 Replacement Mechanical Seal, T21-1/2″-3 1/4″ Elastomer Bellows Water Pump Shaft Seal
  3. John Crane Type 21 Replacement Mechanical Seal, T21-1/2″-3 1/4″ Elastomer Bellows Water Pump Shaft Seal
  4. John Crane Type 21 Replacement Mechanical Seal, T21-1/2″-3 1/4″ Elastomer Bellows Water Pump Shaft Seal
  5. John Crane Type 21 Replacement Mechanical Seal, T21-1/2″-3 1/4″ Elastomer Bellows Water Pump Shaft Seal
  6. John Crane Type 21 Replacement Mechanical Seal, T21-1/2″-3 1/4″ Elastomer Bellows Water Pump Shaft Seal

John Crane Type 21 Replacement Mechanical Seal, T21-1/2″-3 1/4″ Elastomer Bellows Water Pump Shaft Seal

  • Easy Installation:

    Designed as a durable unit for simple field installation, this mechanical seal fits directly onto the shaft and fits perfectly into the pump cavity, greatly reducing installation time and avoiding assembly errors.

  • Perfect John Crane Type 21 Replacement:

    Direct interchangeable with John Crane Type 21 mechanical seals, covering shaft sizes from 1/2″ to 3 1/4″, providing a cost-effective and reliable alternative for pump maintenance.

  • Premium Elastomer Bellows Structure:

    Built with high-performance elastomer bellows, this seal offers excellent flexibility and self-alignment, effectively compensating for shaft runout and wear during operation.

  • Leak-Proof & Stable Performance:

    Engineered for tight sealing and long service life, it delivers consistent, leak-free performance in water pump systems and reduces the need for frequent repairs.

  • Wide Application Compatibility:

          Suitable for centrifugal water pumps, industrial fluid equipment, and water treatment systems, ensuring stable operation in various general-purpose pumping applications.

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John Crane Type 21 Replacement Mechanical Seal

The John Crane Type 21 Replacement is the industry-standard solution for reliable sealing in centrifugal, rotary, and turbine water pumps. Engineered as a direct, high-precision replacement for the original Type 21, this seal ensures seamless compatibility for shaft sizes ranging from 1/2 inch to 3 1/4 inch.

Built for durability and performance, it is the go-to choice for maintenance professionals seeking to reduce equipment downtime without compromising on quality.

Easy Installation:
Designed as a one-piece unit, this seal is exceptionally easy to install. It simply slips onto the shaft and seats squarely in the pump bore, reducing the risk of installation error and ensuring a perfect seal every time.

Applications:
This replacement seal is ideal for a wide range of equipment, including centrifugal pumps, pool pumps, industrial mixers, and compressors. It is perfectly suited for use with water, mild chemicals, and other non-aggressive fluids commonly found in commercial and industrial settings.

Why Choose This Replacement?
By choosing this high-grade replacement for the John Crane Type 21, you are ensuring optimal performance and protection against leaks without paying premium OEM prices. Restore your pump’s efficiency and reliability with this top-tier mechanical seal.

Weight 1.5 lbs
Dimensions 13 × 8 × 9 in
Size

0.5Inch, 0.625Inch, 0.75Inch, 0.875Inch, 1Inch, 1.125Inch, 1.25Inch, 1.375Inch, 1.5Inch, 1.625Inch, 1.75Inch, 1.875Inch, 2Inch, 2.125Inch, 2.25Inch, 2.375Inch, 2.5Inch, 2.625Inch, 2.75Inch, 2.875Inch, 3Inch, 3.25Inch, 3.5Inch
Material

CAR/CER/NBR, CAR/CER/VIT, CAR/SIC/NBR, SIC/SIC/NBR, CAR/SIC/EPDM, SIC/SIC/EPDM, CAR/SIC/VIT, SIC/SIC/VIT, TC/TC/VIT

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