secure the upper component 12 onto the lower mounting base 14 in addition the center rib 38 of the upper component 12 aligns with a center rib 88 depicted in fig1 positioned on the upper surface 70 referring to fig1 13 the lower mounting base 14 further includes a retainer leg 90 located central to the mounting base 14 for snap fitting the retainer 10 of the invention to a hole or opening in a substrate such as a wall or other surface the retainer leg 90 extends outwardly from the bottom surface 72 of the lower mounting base 14 the retainer leg 90 has generally a cylindrical shaped body and a rounded end 92 to facilitate the insertion of the retainer leg 90 into the hole or opening in the substrate referring to fig1 and 15 extending from the retainer leg 90 are opposing retainer leg fingers 94 for permitting the removal of the lower mounting base 14 from the substrate as described below the retainer leg fingers 94 extend through a central opening 96 depicted in fig1 and 13 in the lower mounting base 14 and protrude above the upper surface 70 as illustrated by fig1 as shown in fig1 12 and 15 the retainer leg 90 also.