Endura Products Z-Articulating Cap

The Z-Articulating Cap Sill reduces the likelihood of door unit failure and costly service calls, the manufacturer says. It consists of an articulating cap, integrated end-sealing assemblies, and door bottom, eliminating the need for caulking. The cap has a living hinge and redundant spring assemblies that compensate for the variations in margins between the door and the sill. enduraproducts.com