Chesterton 442 Split Seal

Chesterton 442 Split Seal
High-Performance Seals Available in Large Diameters

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​The Chesterton 442 split seal is ideal for equipment that is difficult and time-consuming to disassemble, such as large pumps, vertical pumps, and horizontal split case pumps. This ​proven, compact design can be used in a wide variety of equipment and process fluids.​

The patented, high-performance split technology allows the 442 to operate from vacuum to high pressures.

  • ​Compact design allows for easy installation and a fit advantage on most equipment
  • Split, low-cost repair kits reduce ongoing maintenance costs even further
  • Designed with the installer in mind, the ball-and-socket O-Rings provide a quick and easy leak-free seal without the use of adhesives
  • Captive screws cannot fall out, making installation straightforward and reliable

1NSF version available upon request.

Video: Chesterton 442 Split Seal Installation

Related Product: Chesterton 442C Cartridge Split Seal

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Fully split mechanical seal
Ball-and-socket O-Rings
Adjustable gland tabs
Patented, automatic centering
Patented, full-vacuum capability
Engineered for high pressure
Non-clog external springs
Non-fretting to equipment
Dry run capable
Large seal diameter options
Integral dual flushport​
Certified to NSF/ANSI 61​
Operating Conditons

Sizes 20 mm – 990 mm (0.750" – 39.000")
Pressure711mm (28") Hg Vacuum to 30 bar g (450 psig)*
Temperature120° C  (250° F)
Speed20m/s (4000 fpm)

ElastomersFKM, EPDM, FEPM
EN 1.4401 (316SS)
Other Metallurgies available on request

Standards and Approvals: ISO-3069-S, ASME B73.1, ASME B73.2, NSF61, ACS, ATEX
*Seal pressure capabilities are dependent on the fluid sealed, temperature, speed, and seal face combinations. For operation outside the limits and additional materials consult Chesterton Mechanical Seal Engineering.



Installation Instructions: 442 (English) Instructions: 442 (English)pdf
Installation Instructions: 442 Split Seal - 200mm to 305mm; 8 to 12 inch shafts (English) Instructions: 442 Split Seal - 200mm to 305mm; 8 to 12 inch shafts (English)pdf
Technical Material Reference (English) Material Reference (English)pdf
Technical Datasheet: 442 Split Mechanical Seal (English) Datasheet: 442 Split Mechanical Seal (English)pdf
Catalog: Mechanical Seals (English) Mechanical Seals (English)pdf