US Patent 7614188 Corner key with pathway

Products and processes for forming structural assemblies for building systems, such as window and door assemblies, are described. One such product includes an apparatus comprising a first end and a second end opposite the first end. A first leg and a second leg are disposed between the first and second ends. A first receiving groove is disposed in the first leg and forms a first pathway. A second receiving groove is disposed in the second leg and forms a second pathway.