Thermal Control Products, Non-Drip Couplings & Nipples

Series 677, DN14 Stainless steel

  • Precision-made dry-break coupling suitable for liquid cooling
  • Safety lock feature to prevent unintentional disconnection
  • One-hand-operated connector with compact dimensions


This robust stainless steel quick connect coupling series 677 is adaptable to virtually all thermal control applications. The colour-coding feature helps to separate incoming cool lines from outgoing hot lines. The non-drip design ensures zero spillage and eliminates pollution and air inclusion during connection and disconnection for long-term use. This stainless steel disconnect series with DN14 is available in three configurations: double shut-off, single shut-off and straight through. In addition, 677 can be delivered with colour-coding and/or key coding for extra safety. Optional seal material is available upon request.


The series is available in four other sizes: series 277, 477, 577 and 777. Please refer to series 667 for an all-brass version. For other sizes in brass, refer to series 267, 467, 567 and 767. If you can’t find a product that meets your requirements, don’t hesitate to contact us, and we’ll put our R&D department at your disposal. Applications: Data server chiller cooling lines, chassis manifolds, IGBTs, power converters, power inverters, rectifiers, industrial drives, power generators, heat exchangers, medical and industrial lasers, traction control, machine tools, solar power, alternative energy.


https://www.cejn.com/globalassets/documents/brochures/SERIES-667-677-WATER-FLOW-CEJN.pdf (Water Flow Series 677 PDF)

Series 677, DN14 Stainless steel
Couplings (Socket) Part No. Connection Seal Length Diameter Hexagon
Female thread 10 677 1220 106771220G 3/4" (BSP), green code*EPDM74.74136


Nipple (Plug) Part No. Connection Seal Length Diameter Hexagon
Female thread 10 677 6220 106776220G 3/4" (BSP), green code*EPDM663936


Check with an authorized CEJN distributor for availability and prices. Other connections and sealing material on request. Some part numbers may be subject to minimum order quantities. CEJN reserves the right to make changes without further notification. Thread connections are listed according to ISO Standards. All measurements are in mm. *Available color coding: green, red, blue, yellow, white and black. Also available with mechanical key coding.
Technical data
Nominal flow diameter: 14 mm (9/16")
Water flow (double shut-off): 97.8 l/min (21.5 GPM UK)
Max. working pressure: 20 bar (290 PSI)
Min. burst pressure: 80 bar (1160 PSI)
Temperature range: -20°C — +150°C (-4°F — +302°F)
Material coupling: Stainless steel, AISI 316
Material nipple: Stainless steel, AISI 316
Kv (double shut-off): 5.87
Cv (double shut-off): 6.78
Comment: Also available in singel shut-off or straight through version.

Water flow capacity measured at 1.0 bar (14.5 PSI) pressure drop.

Fluid Flow
Pressure drop, bar (PSI) Series 677, DN14 Stainless steel Flow, l/min. (GPM UK)

Available files for download

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