Automatic door bottom for door seals bottom opening when door is closed, raises when door opens. Model 4301CPKL features: clear anodized aluminum, PK - PemkoPrene(tm) seal. Low closing force, provide excellent seals to help keep out draft, dust, fumes, moisture, light and sound. End plates provided for all mounting applications. Item supplied 36", can be cut down up to 2" to fit.