Breathing Air Products, Couplings & Nipples

Series 345

  • One-hand operation to connect
  • Automatic safety locking feature
  • Large range of connections available
  • Extremely high flow capacity


Series 345 is a double shut-off series with both a valved coupling and nipple. The specially designed valve provides an extremely high rate of airflow. This series is well-suited for breathing air diving applications and for applications that demand a closed system when disconnected, such as surface air diving. Like most other CEJN breathing air couplings, Series 345 offers one-hand-operated connection, an integrated safety feature that guards against unintentional disconnection, a grip-friendly locking sleeve, and a broad connection range.

Series 345
Couplings Part No. Connection Length Diameter Hexagon
Hose connection 10 345 1004 10345100410.0 mm (3/8")71.524.419
Male thread 10 345 1152 103451152R 1/4"64.524.420
 10 345 1154 103451154R 3/8"62.524.420
 10 345 1254 103451254G 3/8"5824.420
 10 345 1454 1034514543/8" NPT61.524.420
Female thread 10 345 1204 103451204G 3/8"61.525.422
 10 345 1404 1034514043/8" NPT60.525.420


Nipple (valved) Part No. Connection Length Diameter Hexagon
Male thread 10 345 6152 103456152R 1/4"6623.120
 10 345 6154 103456154R 3/8"54.523.120
 10 345 6252 103456252G 1/4"74.724.321
 10 345 6254 103456254G 3/8"6223.120
Female thread 10 345 6202 103456202G 1/4"55.723.120
 10 345 6402 1034564021/4" NPT55.723.120


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: 6.2 mm (1/4")
Air flow: 1100 l/min (38.8 CFM)
Max. working pressure: 35 bar (507 PSI)
Min. burst pressure: 140 bar (2030 PSI)
Temperature range: -30°C — +100°C (-22°F — +212°F)
Material coupling: Nickel-plated brass
Material nipple: Nickel-plated brass
Material seal: NBR

Flow capacity is measured at 87 PSI (6 bar) inlet pressure, and pressure drop at 7 PSI (0.5 bar)

Air Flow
Pressure drop bar (PSI) Series 345 Flow CFM (l/min)

Available files for download

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