An automatic door bottom is a crucial piece of weatherstripping for any door. Automatic door bottoms are designed to seal the gap at the bottom of a door, which is often the largest opening for air and water infiltration. The Pemko 4131CRL36 is a high-quality automatic door bottom that is perfect for both commercial and residential applications. The Pemko 4131CRL36 is made out of clear anodized aluminum, and it features a drop bar seal. The drop bar seal is activated by a plunger, which requires very little force to actuate. This is a great feature, as it means that the door can be sealed even if it's not perfectly aligned. The seal is also designed to compress at multiple points, which further adds to its sealability. The Pemko 4131CRL36 is perfect for doors that see a lot of traffic, as it can stand up to heavy use. It's also a great choice for doors that are subject to wind and weather, as it will provide a reliable seal. If you're looking for an automatic door bottom that is both durable and effective, the Pemko 4131CRL36 is a great option. It's perfect for a variety of applications, and it will provide a reliable seal that will keep your home or office air and watertight.