One-piece spun aluminium body, heavy duty cast aluminium strainer dome, and clamping ring provide strength and durability. The drain flange has a depressed sump area to facilitate water drainage from the roof surface. The patented technology of the U-Flow Seal provides a mechanical watertight connection to PVC or cast iron pipes. Also available with plastic, or the cast aluminium SuperDome, in sizes 3", 4", 5", and 6".

OlyFlow RetroDrains are designed to replace existing drains in reroofing applications. Installed from the roof surface, the OlyFlow RetroDrains are engineered to be installed without removing the existing plumbing or fixture while providing a watertight connection to the roof system and the existing plumbing.