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Olympic Hercules Retro Drain 3" - 6" w/ Pro Seal

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$406.50 - $492.75
Product Overview


One-piece spun aluminum body with a heavy duty cast aluminum strainer dome and clamping ring to provide strength and durability. The drain flange has a depressed sump area to facilitate water drainage from the roof surface.

The Hercules RetroDrain incorporates U-Flow® Seal technology for a mechanical watertight connection to PVC or cast iron pipes, which prevents 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.
  • 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. 
  • Saves time and money by allowing for easy installation from the rooftop without disturbing occupants. 



OlyFlow® RetroDrains are designed to replace existing drains in reroofing applications.

Installed from the roof surface, these drains 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. 


Physical Data

The following data is constant for all Hercules RetroDrain.

Drain Body Seal
11 gauge (0.125-in.) spun aluminum Watertight U-Flow mechanical seal requires U-Flow screwdriver
Flange Strainer Dome
17.5-in. diameter with sump area Cast aluminum, plastic or aluminum SuperDome
Stem Clamp Ring
12-in. length Cast aluminum


Approvals & Standards

ANSI/SPRI RD-1 is a national performance standard for retrofit roof drains. While most retrofit drains are not tested to this standard, OlyFlow Insert Drains—including the Hercules RetroDrains with U-Flow Seal—exceed the standard, which requires that the seal hold a 10-ft. column of water for 24 hours without leaking. 

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