FLASHLOC Duo is a versatile attachment designed for composition shingle and rolled roofs that can be directly attached to the deck and rafter. Its all-in-one mount installs quickly and easily, without the need to kneel on hot roofs to install flashing, pry or cut shingles, or pull nails. To install, simply drive the required number of screws to secure the mount and inject sealant into the base. FLASHLOC features patented TRIPLE SEAL technology that preserves the roof and protects the penetration with a permanent pressure seal. It comes with two rafter screws, sealant, and hardware for maximum convenience (deck screws sold separately). With FLASHLOC, don't just divert water, LOC it out!