Cut the part of the tube to be inserted into the fitting to plane the end. Make sure to use a clean tube without any foreign material or cracks.
When inserting the tube, remove any obstructions before full inserting the tube. Make sure the tube is full inserted. Inserting the tube into the fitting only takes moderate force. The tube or fitting should not be scratched or damaged in the process, as this is the main cause for water leak later on.
To make sure the the fitting is properly connected to the tube,pull it once,after pulling, push the tube into the fitting once more for a completer insertion.
Make sure to completely eliminate pressure before disassembling the fitting. When disassembling the tube.push the clip in direction of the main assembly and then pull the tube out for easy disassembling. Fittings and tube can be reused.