ChemMates™ plastic mixing nozzle extensions slide onto the end of the mixing nozzles for use in deeper holes. The extension sleeve allows the resin to fill from the bottom of the hole upwards with the operator slowly withdrawing the tube as the hole fills. For deeper holes alternate between the 7mm and 8mm extension tubes and/or use the longer extension options listed. NOTE:- Air bubbles MUST be avoided and the use of piston plugs is recommended to achieve this outcome.