• Prevents the tube from contracting
• Even a very soft tube can be used with the Push-in Fitting, if the Insert Ring is inserted in the connecting portion of the tube Suitable to use with Vacuum Tubing (UD) etc.
• The Insert Ring should be installed when a push-in type of fitting is used with water
• Insert ring prevents tube contracting from inside. Tubing's pull-out force is increased for tighter tubing lock