Breathing Air Products, Couplings & Nipples

Series 346

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


The AISI 316 stainless steel construction of Series 346 makes it suitable for agressive applications, such as offshore duty. Its special valve design provides a high rate of airflow. Like most CEJN breathing air couplings, Series 346 offers one-hand operated connection, an integrated safety feature that guards against unintentional disconnection, a grip-friendly locking sleeve, and a broad range of connections.

Series 346
Couplings Part No. Connection Length Diameter Hexagon
Male thread 10 346 1254 103461254G 3/8"59.925.422
 10 346 1452 1034614521/4" NPT63.925.422
Female thread 10 346 1202 103461202G 1/4"61.925.422
 10 346 1402 1034614021/4" NPT60.425.422


Nipples Part No. Connection Length Diameter Hexagon
Hose connection 10 346 5005 1034650059.0 mm5414-
Male thread 10 346 5272 103465272G 1/4"4016.214
 10 346 5452 1034654521/4" NPT42.516.214
Female thread 10 346 5202 103465202G 1/4"41.519.617
 10 346 5402 1034654021/4" NPT40.519.617
 10 346 5404 1034654043/8" NPT4225.422


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: 7.0 mm (9/32")
Air flow: 800 l/min (28.2 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: Stainless steel, AISI 316
Material nipple: Stainless steel, AISI 316
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 346 Flow l/min. (CFM)

Available files for download

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