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John Guest

John Guest Stem Adapter BSPT - 1/2 x 1/2 BSPT

Part Number: PI051604S
Alt. Part Number: ASA8-R4-G
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The John Guest stem adapter makes connecting OD tubing sizes to female BSPT threads easy. Manufactured in gray acetal, these adapters 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
  • Stem easily inserts into JG Push-fit fittings to make a permanent swivel connector
  • 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
  • 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).

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
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