John Crane Type 21 Replacement Mechanical Seal, T21-7/8" Elastomer Bellows Water Pump Shaft Seal 0.875Inch
John Crane Type 21 Replacement Mechanical Seal, T21-7/8" Elastomer Bellows Water Pump Shaft Seal 0.875Inch
John Crane Type 21 Replacement Mechanical Seal, T21-7/8" Elastomer Bellows Water Pump Shaft Seal 0.875Inch
John Crane Type 21 Replacement Mechanical Seal, T21-7/8" Elastomer Bellows Water Pump Shaft Seal 0.875Inch
John Crane Type 21 Replacement Mechanical Seal, T21-7/8" Elastomer Bellows Water Pump Shaft Seal 0.875Inch
John Crane Type 21 Replacement Mechanical Seal, T21-7/8" Elastomer Bellows Water Pump Shaft Seal 0.875Inch
  1. John Crane Type 21 Replacement Mechanical Seal, T21-7/8" Elastomer Bellows Water Pump Shaft Seal 0.875Inch
  2. John Crane Type 21 Replacement Mechanical Seal, T21-7/8" Elastomer Bellows Water Pump Shaft Seal 0.875Inch
  3. John Crane Type 21 Replacement Mechanical Seal, T21-7/8" Elastomer Bellows Water Pump Shaft Seal 0.875Inch
  4. John Crane Type 21 Replacement Mechanical Seal, T21-7/8" Elastomer Bellows Water Pump Shaft Seal 0.875Inch
  5. John Crane Type 21 Replacement Mechanical Seal, T21-7/8" Elastomer Bellows Water Pump Shaft Seal 0.875Inch
  6. John Crane Type 21 Replacement Mechanical Seal, T21-7/8" Elastomer Bellows Water Pump Shaft Seal 0.875Inch

John Crane Type 21 Replacement Mechanical Seal, T21-7/8″ Elastomer Bellows Water Pump Shaft Seal 0.875Inch

Price range: $9.60 through $13.00

Proven Elastomer Bellows Construction

High-precision elastomer bellows ensure outstanding sealing reliability and service life. It effectively eliminates leak paths and cuts downtime by compensating for axial shaft movement and dampening operational vibration in harsh industrial environments.

Direct Drop-In Replacement for John Crane Type 21

Engineered as a full equivalent to John Crane Type 21. Provides OEM-grade performance with a perfect fit, requiring no system modifications or adjustments for immediate installation.

Precision Engineered for 7/8″ (0.875″) Shafts

Custom-designed for standard 7/8″ (0.875″) diameter shafts, delivering stable, vibration-free operation. Minimizes installation errors and improves overall equipment reliability.

Simplified Sourcing & Reduced Total Cost of Ownership

Lowers maintenance and inventory costs without compromising quality. High compatibility streamlines your supply chain and delivers better cost efficiency than original parts.

Wide Industrial Compatibility

Suitable for a broad range of industrial applications, ensuring stable performance across diverse operating conditions.
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Type 21 General-duty Elastomer Bellows Mechanical Shaft Seal

A benchmark choice for OEM engineering teams, the Type 21 general-purpose mechanical seal is engineered to meet the rigorous demands of industrial rotary equipment.
Core Technical Advantages:

Superior Design & Construction:
The T21-7/8″ utilizes a robust elastomer bellows design, which eliminates the need for a dynamic O-ring. This “non-pusher” design allows the seal to compensate for shaft misalignment, vibration, and dirt buildup without wearing out, providing superior performance compared to conventional pusher seals. The rotating unit is manufactured from corrosion-resistant materials, featuring a precision-lapped carbon graphite rotating face and a robust ceramic stationary seat. This combination ensures excellent wear resistance and a long service life under varying pressures and temperatures.

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
Material

CAR/CER/NBR, CAR/CER/VIT, CAR/SIC/VIT, SIC/SIC/VIT

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