John Guest vs Duotight: Which Push Fit Fittings Should I Use?
John Guest and Duotight are both reliable push-to-connect fittings for beer and gas line applications, and both are well suited to home keg dispense. The choice between them is mostly about which ecosystem you’re already in.
John Guest beer fittings use a collet-and-stainless-gripper design that’s been the standard in UK commercial draft systems for decades. They’re the go-to across 3/8″ beer and gas lines (joiners, keg fitting adapters, elbows, tee pieces and splitters) and work with the threaded connections found on most UK regulators and keg disconnects. Duotight fittings take a double O-ring approach to sealing, which performs particularly well under higher gas pressures and allows a tighter bend radius on the line – useful in compact kegerator builds where there isn’t much room to route things cleanly. Duotight sits naturally within the KegLand ecosystem and is available here in 5/16″ (8mm) and 3/8″ (9.5mm).
The two systems aren’t directly interchangeable at the collet, but they can work alongside each other in the same draft system where a threaded adapter bridges between them. For most UK homebrew setups, 3/8″ covers both beer and gas lines throughout; 5/16″ tends to appear on the beer side when using Duotight-style ball-lock disconnects or stepping down for line balance.
Watch Our Youtube Video: A Guide To Push Fit Beer and Gas Line Fittings
FAQs: Push Fit Fittings for Beer & Keg Dispense
What are push fit fittings used for in home brewing?
Push fit fittings (also referred to as push-to-connect or quick connect fittings), are used to join, split, adapt and route beer and gas lines across a keg dispense system. In a homebrew context, they’re the standard way to connect CO2 or mixed gas from a regulator to your kegs, and to run beer line from keg to tap. John Guest and Duotight are the two most widely used brands across home and commercial draft systems.
H3: Do I need any tools to install John Guest or Duotight push fit fittings? No – both John Guest and Duotight are push-to-connect fittings designed for tool-free installation. Cut the beer or gas line cleanly and squarely, push it into the fitting until it locks, and the collet or O-ring system holds it in place without clamps, thread tape or sealing agents. The one tool worth having is the John Guest collet release tool, which makes demounting fittings considerably easier when lines are tight or tucked into a kegerator build — but it’s not needed for installation itself.
What is the best way to get a leak-free connection with push fit beer line fittings?
The most common cause of leaks with push fit beer line fittings is a poorly prepared line end. Cut the tubing cleanly and squarely (not on an angle), so the full circumference seats properly against the O-ring or collet seal. Push the line in firmly until it stops, then give it a gentle tug back to confirm it’s locked. If a connection is leaking after installation, the usual fix is to demount, re-cut the line end cleanly and reseat it. Using the correct line diameter for the fitting is also important — pushing undersized tubing into a fitting won’t create a reliable seal regardless of how it’s installed.
How do I remove a push fit fitting from a beer or gas line?
For John Guest fittings, press the collet ring towards the body of the fitting to release the stainless steel grippers, then pull the line out. The John Guest collet release tool makes this easier, particularly in tight spaces. For Duotight fittings, push the collet inward and pull the hose out in the same motion. Both systems are fully demountable and can be reconnected multiple times without replacing the fitting, which makes reconfiguring or extending a draft system straightforward.
Where can I buy John Guest and Duotight push fit fittings in the UK?
You can buy John Guest and Duotight push fit fittings at The Malt Miller – stocked for homebrew keg dispense, so the sizes, thread configurations and fitting types you actually need are here without any digging around. Alongside the push fit range you’ll find gas line, keg disconnects, regulators and everything else needed to build or extend a home draft system properly.
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