How to Make a Connection with a John Guest Style Fitting
To make a connection, the tube is simply pushed in by hand; the John Guest style collet locking system that holds the tube firmly in place without deforming it or restricting flow.
1. Cut tube square
Cut the tube square. It is essential that the outside diameter be free of score marks and that burrs and sharp edges be removed before inserting into fitting.
Use a tube cutter or a very sharp utility knife. The cut needs to be flat so it can form a seal with the o-ring inside the fitting.
For soft or thin-walled plastic tubing, we recommend the use of a tube insert.
2. Insert Tube Into Fitting
Push the tube into the fitting, to the tube stop. The collet (gripper) has stainless steel teeth which hold the tube firmly in position while the O-ring provides a permanent leak proof seal.
Note that the fitting grips before it seals. Ensure tube is pushed in to the tube stop. You may feel two points of resistance as you push the tubing in. One as it passes the metal teeth, then another as it seals on the o-ring.
3. Pull to check secure
Pull on the tube to check it is secure. It is good practice to test the system prior to leaving site and/or before use.
How to Disconnect a John Guest Style Fitting
1. Push in collet and remove tube
To disconnect, ensure the system is depressurized before removing fitting. Push in collet squarely against face of fitting. With the collet held in this position, the tube can be removed. The fitting can then be re-used.
(Note if the fitting has the red locking clips under the collet, these must be removed before trying to remove the tubing and only re-install the locking clips after the tubing is in place)