The automatic door bottom features a unique sloped top casing to slough off rainwater and prevent pooling on top of the housing in external use, and also simplifies installation by eliminating the need for a separate rain drip. The product is available in three models, including closed cell sponge neoprene, neoprene bulb or neoprene bulb and jacket. The door bottom is available to any length from 12 inches to 96 inches, in anodized aluminum.