• One-piece seamless body provides strength and durabilty without separation of the flange from the stem. 
• Extra large flange allows positive attachment of roof flashing membrane while the sump area facilitates drianage.  
• Simple and easy to install from rooftop in 15 to 30 minutes.
• Cast aluminum strainer dome and clamping ring.
• 12-in. long drain stem accommodates most existing field conditions with longer lengths available.
• Incorporates U-Flow Seal technology for a secure, watertight connection.
• Also available with a plastic dome or the cast-aluminum SuperDome.
• Saves time and money by allowing easy installation from the rooftop without disturbing occupants.

OlyFlow^® RetroDrains are designed to replace existing drains in reroofing applications. Installed from the roof surface, 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.

Click here to access Hercules CAD files

As with all building materials it is the responsibility of the installer to review its usage with a design professional to confirm safety, compatibility and acceptance with the roof cover manufacturer as well as local building codes.