No Frills, No Bells and Whistles, Just a Tube and Piston Rod. A great way to test out the world of Roof Tube. We worked with this 1/2 gallon model simple design for years before adding the upgrades. There is no tip collar system at the bottom. It is completely open. This tube works well with heavy seam grade mastics. It features a 30 degree mitre at the end to help with ease of application. Check out the video below to see what it can draw... Nobody believes me when I say you can draw roof cement...