GOOF PROOF SHOWER Installation System Positive Weep Protector PWP-106 http://www.markeindustries.com/positive-weep-protector.html Watch Video http://www.markeindustries.com/videos/Full_Vinyl.html This patented plastic ring is designed to keep mortar from the weep holes in a drain. The ridges of the Positive Weep Hole ProtectorTM allow for water to flow underneath the mortar and into the weep holes. The inner and outer diameter of the disk are perforated to allow for customization depending on shower drain size.