This is a gray PVC screw-on style gasket. This profile is different than most screw-on gaskets in that it has a barb on the bottom flap that tucks under a rigid lip around the inside perimeter of the door. So this gasket is often referred to a “panel gripper” mount. This profile is often found on Hobart and Vulcan-Hart units. The 059 looks a lot like the 270 profile that mounts like most conventional screw-on gaskets with screws.