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Series 921, DN51 Brass

  • Easily operated to facilitate installation
  • Valveless design to allow unrestricted flow
  • Adapted to endure longer periods of connection


CEJN series 921 is our largest Full-Flow brass coupling in DN51. Larger fluid and pneumatic lines with high flow requirements are ideal for this economical valveless quick disconnect coupling. It permits unrestricted flow, a real advantage for circuits within thermal control management, main supply lines within power electronics, renewable energy solutions, etc. The robust and straightforward design reduces pressure drop and makes it easy to maintain and service. Series 921 has a long service life and works in applications with working pressures up to 20 bar. Optional colour-coded rings and a safety-locking device are available for added safety protection.


For other sizes please refer to 701 and 851. For a stainless steel version. See series 702, 852 and 922. 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: Heat transfer, compressed airlines, various chemical transfers.

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Technical data:

Couplings without valvePart No.ConnectionSealLengthDiameterHexagon
Female thread10 921 0207G 2″ (BSP)NBR74.586.675
Nipples without valvePart No.ConnectionSealLengthDiameterHexagon
Female thread10 921 5207G 2″ (BSP)7886.675