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We take waterproofing very seriously. Being based in the pacific northwest gives US a huge ADVANTAGE due to the fact that it rains here so much. All of our asphalt roofing flashings are a "dual flashing" system that incorporates a base flashing along with a stem cover. The stem cover not only protects the warning label but also gives you the added protection against water penetration. Specs and features: Santoprene base flashing provides years of service life specifically designed for our ars Series stems works on asphalt and wood shake roofs tether strap included to attach stem cover interference fit to keep stem on in windy areas all of our flashing components are made from the highest quality materials ensuring they remain functional for the service life of the roofing materials.