Thermal Control Products, Non-Drip Couplings & Nipples

Series 667, DN14 Brass

  • One-hand operated coupling to simplify maintenance and serviceability
  • Safety lock to prevent unintentional disconnection
  • Precision-made, no-spill flush-face connectors for liquid cooling


Thermal control requires safe, easy and reliable quick connect couplings. CEJN series 667 with DN14 are affordable non-drip modular couplings adaptable to virtually all applications and system requirements. The series ensures practically no spillage and eliminates pollution and air inclusion. Tests confirm that the Non-Drip series withstands over 10,000 connection cycles. Series 667 quick disconnects are available in double shut-off, single shut-off and straight through versions. Upon request they come in color-coding and/or key coding for extra safety. Optional sealing material can be arranged.


The series is available in four other sizes: series 267, 467, 567 and 767. Please refer to series 677 for an all-stainless steel version. Additional sizes in stainless steel are series 277, 477, 577 and 777. 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 667 PDF)

Series 667, DN14 Brass
Couplings (Socket) Part No. Connection Seal Length Diameter Hexagon
Female thread 10 667 1220 106671220G 3/4" (BSP), green codeEPDM74.74136


Nipple (Plug) Part No. Connection Seal Length Diameter Hexagon
Female thread 10 667 6220 106676220G 3/4" (BSP), green codeEPDM663634


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.
Technical data
Nominal flow diameter: 14 mm (1/2")
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 — +80°C (-4°F — +176°F)
Material coupling: Nickel-plated brass
Material nipple: Nickel-plated brass
Kv (double shut-off): 5.87
Cv (double shut-off): 6.78
Comment: Also available in single shut-off or straight through version.

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

Available files for download

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