The Rotech® Drainguard has been designed to prevent rats from gaining access to properties by blocking their route whilst still allowing the normal flow of drains. Drainguards can be quickly and easily installed, either by hand or with the optional mounting pole for hard to reach drains. Made from stainless steel with interference guides on the outside to ensure a snug fit in the sewer pipe. 4" in diameter. Mounting pole and extension bar also available.