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3" Hercules RetroDrain

Price: Call for Pricing
Item Number: 9445
Manufacturer: OMG Roofing Products
Manufacturer Part No: HDAL3A

Retro fit roof drain designed to fit into existing drain leaders in re-roofing applications

One-piece spun aluminum body, heavy duty cast aluminum strainer dome, and clamping ring provide strength and durability. The Hercules RetroDrain incorporates U-Flow® Seal technology for a mechanical watertight connection to PVC or cast iron pipes to prevent water from backup damage.


Features & Benefits

  • One-piece seamless body provides strength and durability without separation of the flange from the stem. 
  • Extra large flange allows positive attachment of roof flashing membrane while the sump area facilitates drainage.  
  • 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 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 re-roofing 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.

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.

Physical Data:

The data below is constant for each Hercules RetroDrain

Drain Body 11 gauge (.125-in.) spun aluminum
Seal Watertight U-Flow nechanical seal requires U-Flow screwdriver
Flange 17 1/2-in. diameter with sump area
Strainer Dome Cast aluminum or aluminum SuperDome
Stem 12-in. length
Clamp Ring Cast aluminum