Oatey 11919 ThermoPlastic Base Flashing, 1.5-Inch-3-Inch, Gray 1-Piece construction eliminates any possibility of the collar coming off Patented positive double seal ensures leak-free fit around vent stack Black Color blends with modern roofing material Colors and is an excellent weathering Color Slides over pipe. Type of base determines pitch Non-fading, non-cracking and non-rusting bases and sealing collars Ring on collar tears off, allowing flashings to seal different pipe diameters Approved for Type B installations Not for hot-mopped or built-up roofs