Breathing Air Products, Couplings & Nipples

Series 221

  • One-hand operated
  • High-flow capacity
  • Extremely small outer dimensions

Requiring only one hand for operation, Series 221 are suitable for a variety of fluid applications, such as water inlet and return for injection molding lines. Series 221 features valved couplings and valveless nipples. Other sealing materials, such as Viton® and EPDM, are available on request. Straight-through couplings are also available on request.

Series 221
Technical data
Nominal flow diameter: 5.0 mm (3/16")
Air flow: 580 l/min (20.5 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: Chrome-plated brass
Material nipple: Chrome-plated brass
Material seal: NBR

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

Air Flow
Pressure drop, bar (PSI)
Series 221
Flow, liters/min. (CFM)
Couplings Part No. Connection Length Diameter Hexagon
Hose Connection 10 221 10211022110216.3 mm (1/4")47.42617
Male thread 10 221 1292102211292G 1/4"38.92617
Female thread 10 221 1222102211222G 1/4"42.92617


Nipples Part No. Connection Length Diameter Hexagon
Hose Connection 10 221 50021022150026.3 mm (1/4")3611-
 10 221 50091022150095.0 mm (3/16")3611-
Male thread 10 221 5152102215152R 1/4"3316.214
 10 221 5251102215251G 1/8"26.512.711
 10 221 5252102215252G 1/4"31.516.214
 10 221 54521022154521/4" NPT3316.214
Female thread 10 221 5201102215201G 1/8"26.51513
 10 221 5202102215202G 1/4"3119.617


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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