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OMG Hercules RetroDrain


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OMG Hercules RetroDrain

The OMG Hercules RetroDrain by OMG Roofing Products has a one-piece spun aluminum body, heavy duty cast aluminum strainer dome, and clamping ring provide strength and durability. These retrofit type drains 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.  Available in 3, 4, 5 and 6 inch sizes with several options to support any project.  TPO or PVC coated flanges are available per quote request.

Features & Benefits

  • Saves time and money with easy rooftop installation (will not disturb occupants).
  • Simple and easy to install from rooftop in 15 to 30 minutes.
  • 12-in. long drain stem accommodates most existing field conditions with longer lengths available.
  • Incorporates U-Flow Seal technology for a secure, watertight connection that exceeds the ANSI/SPRI RD1 standard.
  • Certified by QAI Laboratories to conform with ASME 112.6.4 and CSA-B79-08.

Technical Data

  • Drain Body: 11 gauge (.125-in.) spun aluminum
  • Seal: Watertight U-Flow mechanical seal (requires U-Flow screwdriver for installation)
  • Flange: 17.5-inch diameter with sump area. TPO and PVC coated options available.
  • Strainer Dome: Cast aluminum
  • Stem: 12-inches
  • Clamp Ring: Cast aluminum where applicable.


  • ASME 112.6.4 – Establishes minimum design requirements for roof drains, and certified by QAI Laboratories.
  • CSA-B79-08 – Canadian Standards Association standard for commercial and residential drains and cleanouts, and certified by QAI Laboratories.
  • ANSI/SPRI RD-1 – National performance standard for retrofit roof drains which requires the seal to hold a 10-ft. column of water for 24 hours without leaking.

If you have any questions about this product or would like a quote for TPO or PVC coated drains, please reach out to us at 1 (800) 267-2308 or email us at


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