As well as weatherproofing your garage door, garage door floor seal can also prevent mice and other small rodents from squeezing underneath the gap between the door and the floor. The yellow line provides a highly visible warning for people or vehicles passing over the threshold. The 20mm high garage door floor seal kit has been designed to form a watertight seal between the garage door and the floor against standing water up to 20mm high. The threshold will also prevent leaves, dust and debris from being blown under the garage door, thus ensuring a clean and dry environment. As well as weatherproofing your garage door, our 20mm garage door floor seal can also prevent mice and other small rodents from squeezing underneath the gap between the door and the floor. The yellow line provides a highly visible warning for people or vehicles passing over the threshold. This threshold seal is 20mm high, 110mm wide, and is available in lengths from 2.21m (7'3") to 20m (65') to suit all sizes of garage door.