A method and apparatus for oxidizing materials used in semiconductor integrated circuits, for example, for oxidizing silicon to form a dielectric gate. In seat hole injection nozzles, the annular groove is disposed in the vicinity of the injection orifice. The mounting fixture may include pins for engaging apertures on an electrical box, and magnets for magnetically engaging metal electrical boxes, to help retain the electrical boxes on the mounting fixture during installation. It being understood that various changes may be made in the function and arrangement of elements described in an exemplary embodiment without departing from the scope of the invention as set forth in the appended claims.