3", Thermoplastic, Roof Flashing, 18" x 18" Bases For Code Required Areas, Slides Over Pipe For Pitch To 45 Degree, Non-Fading & Non-Cracking, Rigid Black Thermoplastic Base, Sealing Collar, Do Not Use Petroleum Based Products On Plastic Bases Or Rubber Collars, Rated 180 Degrees Fahrenheit Continuous Heat, Approved For Type B Installations, Not For Hot Mopped Or Built Up Roofs, Southwest, Texas, Kentucky Base For Code Required Areas.