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John Guest

John Guest Bulkhead Union - 3/8 x 1/4

Part Number: PI121208S
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The John Guest bulkhead union is used to connect OD tubing through a cabinet wall or bulkhead. Manufactured in gray acetal with food grade nitrile O-ring, these fittings are suitable for foodstuff and potable liquids. They are also suitable for air and inert gases therefore can be used for CO2 and nitrogen beverage gas lines, pneumatics, vacuum as well as other applications.


  • Push-fit Technology creates reliable, leak-free connections
  • Used to connect OD tubing through a cabinet wall or bulkhead
  • Compatible with plastic or copper OD sized tubing
  • Connect, disconnect, and reconnect in seconds without tools
  • Food Quality and suitable for potable liquids and pure water applications
  • Can be used for air/pneumatic & vacuum applications
  • Acetal body with Nitrile O-Ring
  • Made with lead free materials

Working pressure and temperature: 

  • Max. 150 psi at 68° F
  • Max. 100 psi at 150° F

JG gray acetal is suitable for both compressed air and water (buna-n seal).

3/8" x 1/4" Bulkhead Unions
John Guest DM fit
PI121208S ABU0604
Min - Max
Hole Size
Min - Max
Hole Size
51/64" to 61/64" 51/64" to 1"
California residents Prop 65 Warning
This product contains materials known to the State of California to cause cancer and birth defects or other reproductive harm. www.p65warnings.ca.gov