Breathing Air Products, Couplings & Nipples

Series 340

  • Safety function that prevents accidental disconnect
  • 100% tested and greased for breathing air
  • Hose kits according to EN/NIOSH standards


CEJN series 340 is specially designed for H2S safety breathing air and cascade systems. 100% tested and greased according to breathing air regulation. Safety function “push-to-disconnect”: Stage 1 – push the nipple into the coupling; Stage 2 - at the same time pull back the locking ring of coupling to disconnect. This Safety Feature gives the user the confidence and the assurance that there will be no accidental disconnection. Interchangeable with: ISO 6150B 1/4”.

Couplings Part No. Connection Length Diameter Hexagon
Hose connection 10 340 3004 1034030043/8" Hose71.325.422
 10 340 3005 1034030051/2" Hose71.325.422
Reusable fitting 10 340 3032 1034030321/4” hose76.325.422/19
Male thread 10 340 3152 103403152R 1/4"62.325.422
 10 340 3452 1034034521/4” NPT62.325.422
Female thread 10 340 3202 103403202G 1/4"60.325.422
 10 340 3204 103403204G 3/8"58.825.422
 10 340 3402 1034034021/4” NPT58.825.422


Nipples Part No. Connection Length Diameter Hexagon
Hose connection 10 340 5005 1034050051/2" Hose4817-
 10 340 5004 1034050043/8" Hose4814-
Reusable fitting 10 340 5032 1034050321/4” hose55.621.919/17
Male thread 10 340 5152 103405152R 1/4"42.516.214
 10 340 5452 1034054521/4” NPT41.516.214
Female thread 10 340 5402 1034054021/4” NPT3919.617
 10 340 5202 103405202G 1/4"40.519.617
 10 340 5204 103405204G 3/8"41.523.120


Male to hose Part No.   Length Diameter Hexagon
- 19 900 0892 199000892 47.521.919


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: 5.3 mm (1/4")
Air flow: 700 l/min (24.7 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 304
Material nipple: Stainless Steel 304
Material seal: NBR (Nitrile)

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

Air Flow
Pressure drop PSI (bar) Series 340 Flow l/min. (CFM)

Available files for download

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