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
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

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)
Couplings Part No. Connection Length Diameter Hexagon
Hose connection 10 344 10021034410026.3 mm (1/4")64.124.419
 10 344 10031034410037.0 mm67.624.420
 10 344 100410344100410.0 mm (3/8")67.124.419
Male thread 10 344 1152103441152R 1/4"60.124.420
 10 344 1154103441154R 3/8"58.124.420
 10 344 1155103441155R 1/2"53-22
 10 344 1288103441288G 1/4"55.624.420
 10 344 1294103441294G 3/8"53.624.420
 10 344 14521034414521/4" NPT59.124.420
 10 344 14541034414543/8" NPT57.124.420
Female thread 10 344 1202103441202G 1/4"54.124.420
 10 344 1204103441204G 3/8"57.124.420
 10 344 14021034414021/4" NPT56.124.420
 10 344 14041034414043/8" NPT56.125.422


Nipples Part No. Connection Length Diameter Hexagon
Hose connection 10 344 50221034450227.0 mm4613-
 10 344 50231034450237.0 mm4613-
Male thread 10 344 5252103445252G 1/4"3819.617
 10 344 54521034454521/4" NPT38.519.617
Female thread 10 344 5202103445202G 1/4"36.519.617
 10 344 5204103445204G 3/8"38.523.120


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.

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