Spool-type Rubber Expansion Joints

Style 204 spool-type expansion joints are typically used in vacuum and pressure applications and can be constructed in single, multiple, or filled arch versions. They can connect pipe flanges in concentric or eccentric tapers in order to join piping of unequal diameters and connect misaligned piping.

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 lab and field tested for long life and exceptional reliability
  • Seamless flange face eliminates need for gaskets
  • High pressure and vacuum resistance increases safety and ensures suitability for a wide range of applications
  • Can be custom designed for greater movement capability and easier installation
  • Variety of elastomer and fabric combinations meet the demands of temperature, pressure, and media


  • Size:

    > Min. Inner Diameter: 0.5 in / 15 mm

    > Max. Inner Diameter: 120 in / 3000 mm

  • Temperature:

    > Max temperature rating is based on tube, body and cover materials.  To determine, find the minimum temperature based on materials selected.

    Body Material  |  Max. Temp.

    Polyester (Standard): +250°F (+120°C)

    Fiberglass/Kevlar: +400°F (+205°C)
  • Pressure and Vacuum Rating:

EJ 204 Table

  • Vacuum Rating (all sizes and pressure classes):

    > Full vacuum / 29.9 in Hg / 750 mm Hg


  • Canadian Registration Number (CRN) - All Provinces - 204HP
  • Nuclear - 10CFR50 Appendix B, 10CFR21, and NQA-1 basic - 204, 204HP, 204EPS
  • ABS Type Approval - 204HP
  • ASTM F-1123 Compliant - 204HP, 204EPS


  • 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)
  • EPDM/FDA EPDM: +300°F (+150°C)
  • HNBR (Hydrogenated Nitrile): +300°F (+150°C)
  • Nitrile/FDA Nitrile: +250°F (+120°C)
  • Chlorobutyl (Standard): +300°F (+150°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


  • Chlorobutyl extends to outside flange diameter
  • Durable coating resists 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