Style 204 Narrow Arch Expansion Joint

Style 204 Narrow Arch Expansion Joint

Expansion Joints » Style 204 Narrow Arch Expansion Joint

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. 2D and 3D Cad Drawings available upon request for your specific requirements. Call Munaco for Details.



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

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


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


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

Download Style 204 Spec Sheet

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Contact us by Phone800-986-2055