Breathing Air Products, Couplings & Nipples

Series 340

  • Safety function that prevents accidental disconnect
  • 100% tested and greased for breathing air
  • Hose Kits comply with all breathing air standards

CEJN series 340 is specially designed for H2S safety breathing air and cascade systems. 100% tested and greasing 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”.

Series 340
Technical data
Nominal flow diameter: 6.2 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 6 bar (87 PSI) inlet pressure, and pressure drop at 0.5 bar (7 PSI).

Air Flow
Pressure drop bar (PSI)
Series 340
Flow l/min. (CFM)
Couplings Part No. Connection Length Diameter Hexagon
Reusable fitting 10 340 30321034030321/4” hose--22
Female thread 10 340 34021034034021/4” NPT---
Male thread 10 340 34521034034521/4” NPT---


Nipples Part No. Connection Length Diameter Hexagon
Reusable fitting 10 340 50321034050321/4” hose---
Female thread 10 340 54021034054021/4” NPT--17
Male thread 10 340 54521034054521/4” NPT--14


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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