Dennis Briening, Instructional Chair of Scientific Glass Technology at Salem Community College, demonstrates the fabrication of a moderately advanced project for incorporating a one-liter flask and a two-liter flask into one unit to create a one-liter, full-jacketed, four-neck flask. This tutorial was originally published on page 50 in the Spring 2011 issue of The Flow. Demonstration by Dennis Briening Photography by Kelly Gralley, Salem Community College