W Valley, also known as Valley Flashing or Valley Metal, is used to channel water away from the intersection of two roof planes, preventing water intrusion and leaks. Its features include a durable material, such as galvanized steel or aluminum, with a folded design that fits securely over the intersection to direct water away. The benefits of W Valley include improved waterproofing, reduced risk of leaks and water damage, and enhanced durability and longevity of the roofing system.