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This John Guest stem fitting is made of acetal copolymer and has stem and hose connectors. This stem fitting is for connecting pipes or tubes in a straight line. It is a stem fitting that inserts into tubing to connect pipes or tubes with different ends. The fitting is made of acetal copolymer plastic, which has low moisture absorption, high tensile and flexural strength, and is hard and fatigue resistant. The working pressure for this fitting is up to 150 pounds per square inch (psi), and it meets National Sanitation Foundation (NSF)/American National Standards Institute (ANSI) standards 14, 51, and 61 for plastic piping systems, food equipment materials, and use with drinking (potable) water.
Pipe fittings are components used for connecting, terminating, controlling flow, and changing the direction of piping in many different industries. Push-to-connect compression fittings do not require tools or sealants, and are useful in installations where a heat source, such as a soldering torch, is prohibited. When purchasing pipe fittings, consider the application, as this will affect material type, shape, size, and required durability. Fittings are available threaded or unthreaded, in many shapes, styles, sizes, and schedules (pipe wall thickness).
John Guest manufactures push-to-connect fittings and pipe and plastic plumbing systems. The company, founded in 1961, is headquartered in Great Britain and meets International Organization for Standardization (ISO) standard 9001.
Jasonmemo
August 1, 2025
I recently utilized the John Guest Acetal Copolymer Barbed Tube Fittings with a 1/4" stem OD and 3/16" hose ID for a home brewing project, and they performed exceptionally well.Installation:The fittings were straightforward to install. The barbed design ensured a secure connection with the tubing, preventing any leaks during operation. I appreciated that no additional tools were required for installation, making the process quick and efficient.Build Quality:Constructed from acetal copolymer, these fittings exhibit low moisture absorption and high tensile and flexural strength, ensuring durability and longevity. The material is also suitable for potable liquids, which was crucial for my brewing setup.JOHN GUESTPerformance:During use, the fittings maintained a tight seal, withstanding the pressures involved in my brewing process without any issues. Their compatibility with both plastic and copper tubing adds to their versatility, making them suitable for various applications beyond brewing.Pros:Easy Installation: No special tools required; the barbed design ensures a secure fit.Durable Material: Acetal copolymer construction offers strength and longevity.Versatile Use: Suitable for potable liquids, air, and inert gases, making them ideal for multiple applications.Secure Connection: Provides a leak-free seal when properly installed.Cons:Size Specificity: Ensure compatibility with your tubing dimensions to achieve the best fit.Final Thoughts:The John Guest Acetal Copolymer Barbed Tube Fittings are a reliable choice for anyone needing secure and durable connections in their fluid or air handling systems. Their ease of use and robust construction make them a valuable addition to both DIY projects and professional setups.
Brad D
July 29, 2025
These are excellent for converting a beer draft line over to push-to-connect fittings on a draft tower. Keep the tubing as-is at the draft faucet, but add one of these on the end by the coupler. With 5/8" BSP Female x 3/8" push-to-connect fitting, you can replace the Beer Nut at the coupler. They also make a 1/4" F Flare to 3/8" push-to-connect fitting you can use on Corny kegs. Now you can switch your kegerator back and forth from Sanke to Corny with ease!
Reddie
June 25, 2025
Great product and service
Jeremy
June 4, 2025
These pieces pit perfectly into my Swiss Flow 800 meters and they are quite sturdy. I use tubing with a thick wall diameter so having a strong barb is nice.
John D. Stephens
May 12, 2025
It’s a fitting
AAdoh
March 5, 2025
Delivered only one piece instead of a pack of 10!
Mamalolly
March 4, 2025
Can't find comparable in the store...these work perfectly to connect soaker hose to plain plastic hose. Ordering again.
John D.
March 3, 2025
Would give 1-star to just the 3/16" if there was a way to do it.The 3/16" Hose ID barbs only have a 1/16" ID within the barb itself, resulting in a restriction 9x smaller than the hose. This is equivalent to the flow resistance of about 18' of hose, or 36' if you need two of them (which you likely need). I had to return these because that left it impossible to cut the hose short enough to compensate.Ideally the barbs have the same ID as the hose, and the hose would just stretch over the larger OD. That may not be possible with these acetal barbs, which have 2/16" of diameter in plastic: that is a lot of stretching. Stainless steel barbs usually only add half that, or less. If you stick with acetal, I'd at least recommend stretching a 3/16" hose over a 1/4" barb, since that would only result in 2.25x restruction, much better than 9x. Any size will be mathematically better than these 3/16" barbs (too much plastic, not enough hole). The larger the barb, the less a concern this is.
Stephen Cord
January 23, 2025
I had to file it down to get it to fit a 12mm john guest connector. Other than that, it was as described and seems good quality.
BigMel
December 4, 2024
Looks like a dream
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