Pro-Flash Building Envelope Seals from Mainline Backflow Products simplify sealing around any exterior sidewall pipe penetration. To install, simply slide the seal over the pipe for a weathertight elastomeric seal. Water-resistive barriers can then be tied in to complete the installation. Breathable and nonbreathable options are available, making for simple integration into any building envelope system. They are fully flexible, allowing them to easily form around any building contour or fitting that is tight to the exterior wall. Each unit comes with multiple score lines to accommodate different pipe sizes. 877/734-8691; www.pro-flash.com.