I used this to prevent rainwater from entering from a crack under my door as my seal was leaking when a strong wind blew heavy rain on the door. The dripper works like an umbrella, catching water and directing it where you don't want it. In this case, it diverts the water about an inch from the bottom edge of the door, which is enough for a small droplet or any droplet on the floor to change course and get inside. As others have said putty between the door and the drip cap would be a good idea. Aluminum cut with a hacksaw.
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