Breathing Air Products, Couplings & Nipples

Series 348

  • One-hand operated to connect
  • Stainless steel valve opener
  • Automatic safety locking feature

Series 348 offers a partial stainless steel construction with a lower connection force than competitive styles. The series features a valved nipple that makes the double shut-off design well-suited for fire-fighting applications. Like most CEJN breathing air couplings, Series 348 couplings offer one-hand-operated connection and an integrated safety feature that guards against unintentional disconnection.

Series 348
Technical data
Nominal flow diameter: 4.1 mm (5/32")
Air flow: 650 l/min (22.9 CFM)
Max. working pressure: 10 bar (145 PSI)
Min. burst pressure: 140 bar (2030 PSI)
Temperature range: -30°C — +150°C (-22°F — +302°F)
Material coupling: Nickel-plated brass/stainless steel
Material nipple: Stainless steel (body)/nickel-plated brass
Material seal: EPDM

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 348
Flow l/min. (CFM)
Couplings Part No. Connection Length Diameter Hexagon
Hose connection 10 348 10021034810026.3 mm (1/4")67.524.420


Nipples Part No. Connection Length Diameter Hexagon
Hose connection 10 348 60021034860026.3 mm (1/4")5423.521


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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