FD-4160EXOF series of roof drains with over flow consist of a deep sump cast iron body with bottom outlet, a removable cast iron dome strainer, integral combined standpipe type water dam and waterproofing membrane clamp with integral gravel stop, and adjustable extension sleeve.
Used in flat roofs of any construction where a constant height of water is required. Also used as a Secondary Drain (emergency overflow), draining water when the depth of the water on the roof exceeds the standpipe type water dam height. This Drain can be used near to main (Primary) drain for limited space installations. 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 sufficient free area for quick drainage of rain water and protects the drain sump and connected piping from the intrusion of debris. The Flashing clamp holds flashing and roofing materials securely to the drain body.