Easy-Trim Clear Weep Vents Pack of 20 provides essential ventilation and drainage for internal wall cavities. British Made and manufactured to BS EN ISO 9001, these vents satisfy NHBC Standards. Dimensions are 100mm x 65mm x 9mm. The product slots between two bricks and is mortared into position, offering an unobtrusive ventilation point. It features a baffled grille to prevent driving rain and wind ingress, an insect grille, and a drip lip. The grille size keeps out large insects but remains clear of debris, paint, or water droplets. Use in any situation requiring water discharge from external walls, such as at ground floor slab level, within cavity tray systems, or over external lintels. Suitable for walls 100mm or thicker made from brick, block, or stone. Designed for reliable water discharge and less prone to pointing-up issues than open perp. joints. The integral front grille prevents large nest-building insects from entering the cavity, with a 4mm wide aperture to ensure this. Available in a range of colours to blend with brick or mortar. Quality assured, complying with all relevant Building Regulations and British Standards.