Breathing Air Products, Couplings & Nipples

Series 344

  • One-hand operated to connect
  • Automatic safety locking feature
  • Extremely high flow capacity
  • Light weight


Series 344 is specially designed for applications with low-weight requirements. The shorter design of the coupling gives it a significantly lower weight than other couplings with the same performance. Series 344 is recommended primarily for breathing air firefighting applications, but is also well suited for diving equipment. Its specially designed valve provides an extremely high rate of airflow. Like most other CEJN breathing air couplings, this series 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 344
Couplings Part No. Connection Length Diameter Hexagon
Hose connection 10 344 1002 1034410026.3 mm (1/4")64.124.419
 10 344 1003 1034410037.0 mm67.624.420
 10 344 1004 10344100410.0 mm (3/8")67.124.419
Male thread 10 344 1152 103441152R 1/4"60.124.420
 10 344 1154 103441154R 3/8"58.124.420
 10 344 1155 103441155R 1/2"5325.422
 10 344 1288 103441288G 1/4"55.824.420
 10 344 1294 103441294G 3/8"53.624.420
 10 344 1452 1034414521/4" NPT59.124.420
 10 344 1454 1034414543/8" NPT57.124.420
Female thread 10 344 1202 103441202G 1/4"54.124.420
 10 344 1204 103441204G 3/8"57.124.420
 10 344 1402 1034414021/4" NPT56.124.420


Nipples Part No. Connection Length Diameter Hexagon
Hose connection 10 344 5022 1034450227.0 mm---
Male thread 10 344 5252 103445252G 1/4"3818.717
Female thread 10 344 5202 103445202G 1/4"-18.717
 10 344 5204 103445204G 3/8"-22.520


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: 7.4 mm (9/32")
Air flow: 1950 l/min (68.8 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
Interchangeable with: -

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

Air Flow
Pressure drop bar (PSI) Series 344 Flow l/min. (CFM)

Available files for download

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