Breathing Air Products, Couplings & Nipples

Series 347

  • One-hand operated to connect
  • High flow capacity
  • Automatic safety locking feature

Developed to prevent potentially dangerous cross-connections in industrial applications, CEJN Series 347 nipples are noninterchangable with any other CEJN series couplings. The series is useful in applications with multiple access points for different media, such as breathing air, compressed air, and gas. The double shut-off series has a valved nipple. The special valve design of both the coupling and nipple provide an extremely high rate of airflow. Like most CEJN breathing air series, Series 347 offers one-hand-operated connection, an integrated safety feature that guards against unintentional disconnection, and a grip-friendly locking sleeve.

Series 347
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 6 bar (87 PSI) inlet pressure, and pressure drop at 0.5 bar (7 PSI).

Air Flow
Pressure drop bar (PSI)
Series 347
Flow l/min. (CFM)
Couplings Part No. Connection Length Diameter Hexagon
Hose connection 10 347 100410347100410.0 mm (3/8")71.524.419
Male thread 10 347 1254103471254G 3/8"60.524.420
Female thread 10 347 1204103471204G 3/8"61.524.420
Stream-Line 10 347 10621034710628 x 12 mm69.524.420/19


Nipples with valve Part No. Connection Length Diameter Hexagon
Hose connection 10 347 600410347600410.0 mm (3/8")73.523.120
Male thread 10 347 6254103476254G 3/8"6223.120
Female thread 10 347 6204103476204G 3/8"58.123.120
Stream-Line 10 347 60621034760628 x 12 mm71.523.120


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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