3/8" Stem x 1/4" Tube Reducer | John Guest Stem-to-Tube Reducer Fitting

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Brand John Guest

John Guest Fittings Quick Connect Push Fittings
John Guest Quick Connect Fittings - 3/8" x 1/4" Stem-to-Tube Straight Reducer Fitting

Plumbing Fittings for Water Treatment Systems

John Guest  PI061208S is a straight stem-to-tube reducer fitting with 3/8" OD stem on one side x 1/4" Quick-Connect (Push-Fit) Tube connection on the other side.

John Guest PI inch size fittings are manufactured in acetal. With a food grade EPDM ‘O’ ring, they have been developed for the water industry but are equally suitable for other potable liquids. They are also recommended for intermittent hot water applications.  Also suitable for compressed air and vacuum applications.

  • Push-fit technology
  • Quick disconnection without the need for tools
  • Food Quality and suitable for potable liquids and pure water applications
  • Suitable for compressed air and vacuum applications

Accepted by almost all the world’s beer and beverage producers and by the manufacturers of drinks dispense equipment, John Guest products have quality and performance approvals from leading testing and acceptance authorities.
John Guest Fittings Accreditations

  Specifications for PI061208S
John Guest Part Number: PI061208S
Brand: JG Speedfit
Manufacturer: John Guest
Material: Acetal
Stem Connection: 3/8" OD Push-In Stem
Tube Connection: 1/4" Quick Connect
Fitting Type: Straight

NSF-61 For Drinking Water
NSF-51 For Food
FDA For Food And Beverage

water treatment products instructions water treatment products specifications

How to Connect John Guest Fittings


Additional Resources for Using John Guest Fittings

How to Make a Secure Connection with John Guest Fittings

  • Cut the tube Square
    John Guest Fittings Tubing Connections
    Cut the tube square and remove burrs and sharp edges. Ensure the outside diameter is free of score marks. For soft or thin walled tube we recommend the use of a tube insert.
  • Push up to tube stop
    John Guest Fittings Tubing Connections
    Push the tube into the fitting, to the tube stop.

  • Pull to check secure
    John Guest Fittings Tubing Connections
    Pull on the tube to check it is secure. Test the system before use.

  • TO DISCONNECT:   Push in collet and remove tube
    John Guest Fittings Tubing Connections
    To disconnect, ensure the system is depressurized, push the collet square against the fitting. With the collet held in this position the tube can be removed.


Typical Bar Installation (click to enlarge & download)

Typical Bar Installation Using John Guest Fittings