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Style 204 Narrow Arch Expansion Joint

Spool-type Rubber Expansion Joints

The Style 204 family of spool-type expansion joints are manufactured with the industry standard narrow arch design. This style is intended to be used in dynamic conditions where both pressure and vacuum concerns are present.

View Expansion Joint Style 204 3D Model/Rendering

View Expansion Joint Style 204EPS 3D Model/Rendering

View Expansion Joint Style 204HP 3D Model/Rendering

Regional Availability Restrictions: 
Not available in Europe


  • Fully laboratory and field tested for long life and exceptional reliability
  • High pressure and vacuum resistance offer increased safety and ensure suitability for a wide range of applications
  • Single and multi-arch designs are available for a range of movement capabilities
  • Concentric and eccentric reducing configurations can be provided to join piping of unequal diameters
  • Available in a variety of elastomers and fabric combinations to meet the varied demands of temperature, pressure, and media


  • Size:

    > Min. Inner Diameter: 0.5 in / 13 mm

    > Max. Inner Diameter: 120 in / 3000 mm

  • Temperature:

    > Max temperature rating is based on the lowest temperature of the material selected

  • Pressure and Vacuum Rating:

EJ 204 Table

  • Vacuum Rating (29.9 In. Hg (750mm Hg.)

    > Full vacuum rating for all sizes and face to face
  • > Style 204EVS available for continuous full vacuum service


  • Canadian Registration Number (CRN) - All Provinces - 204HP (1/2" - 96" ID)
  • 10CFR50 Appendix B - 204, 204HP, 204EPS
  • ABS Type Approval - 204HP (1/2" - 96" ID)
  • ASTM F-1123 Compliant - 204HP, 204MAX on request


  • Rigid piping systems
  • Compensate for axial, lateral, torsional, and angular movement
  • Compensate for misalignment


For more info on these materials click here.

  • ABRA-LINE™: +180°F  (+80°C)
  • ABRA-SHIELD®: +300°F (+150°C)
  • Natural Rubber: +180°F (+80°C)
  • GUARDIAN® FEP: +400°F (+205°C)
  • FKM (Fluoroelastomer): +400°F (+205°C)
  • CSM: +250°F (+120°C)
  • SURE-TEC™ FDA/NSF-61 EPDM +250°F (+120°C
  • EPDM/FDA EPDM: +300°F (+150°C)
  • HNBR (Hydrogenated Nitrile): +300°F (+150°C)
  • Nitrile/DETECTOMER® FDA Nitrile: +250°F (+120°C)
  • Chlorobutyl (Standard): +250°F (+120°C)
  • Neoprene/FDA Neoprene: +250°F (+120°C)


Standard Design


  • Chlorobutyl resists cracking due to high temperatures, weathering, oxidation, and chemicals
  • Abrupt arch configuration provides maximum movement and maximum pressure and vacuum resistance
  • Seamless tube creates a positive flange seal without gaskets


  • Chlorobutyl/polyester construction with welded, treated metal body rings for dimensional stability


  • A homogeneous layer of chlorobutyl fully extends to the outside edge of the flange
  • A durable exterior coating futher protects the expansion joint from the effects of weathering and oxidation

Optional Configurations

  • Multiple arch for higher movements
  • Filled arch to eliminate media buildup
  • Oversized arch for higher movements
  • Concentric and eccentric tapers to connect piping of unequal diameter
  • Custom Drilling - ANSI, DIN, AWWA, BS, JIS, and special drilling patterns available on request
  • Extended face-to-face
  • Accommodate misalignment: lateral, angular, and torsional offsets
Find SDS and MSDS Documents