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John Guest Stem Elbow Adaptors


Our John Guest Stem Elbow Adaptors allow for the conversion of a 3/8” push fit connection to a 1/4″ push fit connection. The 3/8” stem pushes into an existing 3/8” female push fit, which reduces the connection to 1/4″ – making this fitting popular for drinking water filters and reverse osmosis systems. They are manufactured from acetal copolymer which makes them corrosion resistant and suitable for use with drinking water, potable liquids and inert gasses.

Why Choose Our John Guest Stem Elbow Adaptors?

  • Manufactured by world renowned fittings manufacturer John Guest
  • Reduces a 3/8” push fitting to a 1/4″ push fitting
  • Safe for use in drinking water applications
  • Quick and easy leak-proof connections

Need help with our John Guest Stem Elbow Adaptors? Give us a call on 01622 933 853


Our John Guest Stem Elbow Adaptors offer a quick and reliable solution to reducing a 3/8” push fit to a 1/4″ push fit, with the tubing connected at a 90⁰ angle. These adaptors are manufactured from WRAS approved materials and as such are suitable for use in drinking water and food and beverage applications – including for use with RO and DI water. These fittings are quick and easy to use and can be disconnected just as easily if required.

Please note we are able to supply a range of John Guest connectors and adaptors not listed on our website. For customers looking for a particular connection do not hesitate to get in touch with a member of our team.

Key Product Information

  • Meets WRAS and FDA requirements for drinking water
  • Manufactured from non-toxic Acetal Copolymer
  • Suitable for use with RO and DI water
  • Excellent chemical compatibility
  • Genuine John Guest Product

Need help with our John Guest Stem Elbow Adaptors? Give us a call on 01622 933 853


Suitable For

Light Commercial, General Plumbing, Manufacturing, Drinking Water, Window Cleaning, Car Detailing, Home & Domestic, Boats & Caravans


3/8” Male Stem To 1/4" Push Fit (PI221208S)


Acetal Copolymer


Soft Tubing (Plastic/PVC)


BSI Kitemark

Max Pressure

10 Bar (at 20⁰C)

frank woolnough
frank woolnough
The first time using this site, and im more than pleasd with the service and delivery of the product. Will use again no problem.
Gary Kinsley
Gary Kinsley
Excellent service, fast delivery (although there was no urgency) and great after sales service from Becky who's very helpful and knowledgeable.
Eamonn Dorling
Eamonn Dorling
Prompt and well informed service
Marco Polo
Marco Polo
This company gives the best customer service I have EVER EXPERIENCED in the UK. If every company gave this much care and attention to their customers the UK would easily lead the world in business. Truly ⭐️⭐️⭐️⭐️⭐️ I cannot recommend enough Marco Crawford
Gary Barbour
Gary Barbour
The team were brilliant offering great advice, very knowledgeable on their products and I will definitely be using them again!
Alice Sefton
Alice Sefton
Really great service, I wasn't too sure what size of water filter to order so sent in a picture, the size was identified and the new filters were with me a day after purchase.
Jill and Garry Clark
Jill and Garry Clark
Excellent service.
Matthew Durdy
Matthew Durdy
Prompt service and follow up. Like it should be.
Resin cleaner turned up on time and worked as expected. Great service - Will use again

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