The glass tube is made from strong borosilicate glass and is easy to replace. Simply pull on the old tube to dislodge it from the Toro e-rig. Wipe down the area then replace it with the new glass tube by pushing it firmly into place. The carb cap replacement is ready to use right out of the box and rests on top of the glass tube. It can be used as a dab tool and creates a vent for the atomizer.