DynaVap Glass Stem with freezable Glycerin. Great Cooling System For Dynavap.

DynaVap Glass Stem with freezable Glycerin. Great Cooling System For Dynavap. Enjoy the cooling effect from Glycerin with new Glass Steam for Dynavap. Before using cool it down in the freezer for about 30 minutes. The stem can keep in the freezer always, it will not damage. It can be also cool down in the Ice when you use it outside.