DN51 (Series 921)

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Fluid Products

Full-Flow Brass Couplings & Nipples

DN51 (Series 921)

  • Valveless design
  • Unrestricted flow
  • Tarnish-resistant finish

CEJN Series 701, 851, and 921 brass couplings feature an economical valveless design that permits unrestricted, high flow and accommodates high viscosity fluids. The straightforward design reduces pressure drop. The couplings offer long service life in low-pressure applications, such as fluid transfer, mold coolant/heating, chemical processing, and vacuum service. Optional color-coded rings and a safety-locking device are available for added safety protection.


CEJN full-flow couplings are also available in stainless steel. See Series 702, 852, & 922.

Technical data
Nominal flow diameter: 50.8 mm (2")
Max. working pressure: 20 bar (290 PSI)
Min. burst pressure: 80 bar (1160 PSI)
Temperature range: -30°C — +100°C (-22°F — +212°F)
Material coupling: Nickel-plated brass
Material nipple: Nickel-plated brass
Couplings without valve Part No. Connection Seal Length Diameter Hexagon
Female thread 109210207G 2"NBR74.586.675
 109210407NPT 2"NBR65.586.675


Nipples without valve Part No. Connection Seal Length Diameter Hexagon
Female thread 109215207G 2"-7886.675
 109215407NPT 2"-6986.675


Thread connections are listed according to ISO Standards. All measurements are in mm. Check with an authorized CEJN distributor for availability and prices.