FD-4080EX series of dome type roof drains consist of cast iron large sump body with bottom outlet, membrane clamp with integral gravel stop, secured dome and adjustable extension.
Used in flat roofs of any construction. The adjustable extension sleeve permits adjustment, easily accommodating different insulation thicknesses. The threading allows smooth perimeter movement and support of the top at any adjusted elevation. The dome provides maximum free area for quick drainage of rain water through the large sump body and protects the drain and connected piping from the intrusion of debris. The Flashing (V-Shape) clamp holds flashing and roofing materials to the drain body without puncturing.