The 1143 Cavity Wall Weep is the ideal tool for any residential or commercial construction project. This multi-function product offers reliable discharge of water from inside cavity walls, and also assists in achieving ventilated cavities. By providing a +50mm extension, the 1144 Cavity Wall Weep Extension is perfect for installation over external lintels and within cavity tray systems. In addition, it's suitable for use on external walls that are 100mm or more in thickness and built from brick, block, or stone. With this product, builders can ensure safe leakage prevention while ensuring optimal resistance against mould growth and moisture accumulation enabling building projects to last a lifetime.