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John Guest push-in fittings ensure a durable, secure, and tight connection between the pipe and the connecting element.
John Guest push-in fittings are ideal for complex piping systems, as well as for training and inspection equipment where frequent connection and disconnection of lines is necessary.

Connection Ø 4 mm - Ø 22 mm Cut the pipe at a right angle and remove any burrs. Check that the pipe is free of sharp edges, longitudinal scratches, and other damage. The connection holds even before sealing. The coupling grips the pipe even before sealing. Insert the pipe as far as it will go. Insert the pipe as far as it will go. The fitting has stainless steel teeth that secure the pipe in the fitting. The ring seal creates a perfectly tight connection. Checking the connection by pulling the pipe Check that the pipe is securely seated. This can be verified by pulling the pipe in opposite directions. Disconnecting the connection The pipe can be disconnected by pushing the fitting backwards.

Pipe system technology 0 28 mm New 28 mm fittings The Speedfit series has been expanded to the 28 mm dimension. Like all Speedfit fittings, it features a stainless steel serrated frame and an O-ring seal, ensuring excellent strength and a leak-proof connection. The fittings can be assembled and disassembled without tools. Creating a 28 mm pipe system connection As with other sizes, a secure connection can also be made by simply inserting the pipe into the fitting. Turning the nut 1/4 turn (1 audible click) double-secures the connection and compresses the seal to the pipe's outer diameter. This action reduces the possibility of longitudinal and lateral displacement of the pipe. Disconnecting the pipe system connection by 28 mm To disconnect the push-in pipe connection, turn the nut 1/4 turn counterclockwise. The connection is unlocked and can be disconnected by pressing the socket. (see Disconnecting a 4-22 mm connection)

• Simple and quick assembly,
• Ideal for compressed air and liquids
• Tool-free assembly
• Quick disconnection of connections
• No additional sealing required
• Suitable for most metal or plastic pipes
• Can be connected and disconnected multiple times
• Very good flow properties
• Wide range of products (modular system)
• Protective caps for securing the installation or color coding





Working Pressure and Temperature Ranges
The fittings can be used for the following pressure and temperature values:

Temperature	pressure* about 4-8 mm 5/32“-5/16“	pressure* about 10-28 mm 3/8“-1/2“
Air -20 °C	16 bar	10 bar
Liquids and air
+1 °C	16 bar	10 bar
+23 °C	16 bar	10 bar
+70 °C	10 bar	7 bar

* Pressure data depends on the pipe material.

Pipe Types
Plastic Pipes
Pipes made of polyethylene (PE), polyamide (PA), or polyurethane (PUR), meeting the tolerances (see below).
For soft or thin-walled pipes, we generally recommend the use of stiffening sleeves.
Metal Pipes (Soft) Pipes made of brass, copper, aluminum, meeting the tolerances (see below).
For metal pipes (hard), the suitability of plug-in connectors must be checked beforehand.
It is essential to ensure that the outer surface of the pipe is not damaged or has longitudinal scratches.

Pipe Tolerances
The connectors can be used for pipes with the following dimensions and tolerances.

avg. external pipes (in inches)	5/32“-3/16	1/4“-1/2“
Tolerances (inches)	+0.001“/-0.003“ +0.03/-0.08mm)	+0.001“/-0.004“ (+0.03/-0.10mm)