Copper Hercules Roof Drain

The Copper Hercules RetroDrain features an extra large flange with depressed sump for improved water flow, and a heavy-duty cast aluminum strainer dome and clamping ring which provide strength and durability. The Copper Hercules RetroDrain incorporates U-Flow® Seal technology for a watertight mechanical connection. Also available with plastic or cast aluminum SuperDome, in 3-in., 4-in., 5-in. and 6-in. sizes.

Features & Benefits

  • 3-in. and 4-in. are manufactured from .032-in. spun-punched copper; 5-in. and 6-in. are manufactured from .050-in. spun-punched copper.
  • Extra large flange - 17.5-in. with depressed sump area.
  • Cast aluminum strainer dome and clamping ring will not rust.
  • 12-in. long drain stem.
  • Incorporates U-Flow Seal technology for a secure, watertight connection.
  • Also available with plastic or cast aluminum SuperDome® and OverFlow, FlowControl or QuickFlow attachments.
  • Simple and easy to install from rooftop.


For detailed drawings, click here.  For 3-Part Specifications, click here.

Ordering Info
Downloads & Videos


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.

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.


Ordering Information

SKUSize (in.)PackagingWeight (lbs.)
HDCU3A 3 Each 32
HDCU4A 4 Each 32
HDCU5A 5 Each 32
HDCU6A 6 Each 32


Physical Data:

The data below is constant for each Copper Hercules RetroDrain.

Drain Body .032-in. spun-punched copper (3-in. & 4-in.); .050-in. spun-punched copper (5-in. & 6-in.)
Seal Watertight U-Flow nechanical seal requires U-Flow screwdriver
Flange 17 1/2-in. diameter with sump area
Strainer Dome Cast aluminum, plastic or aluminum SuperDome
Stem 12-in. length
Clamp Ring Cast Aluminum

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