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Hercules® Roof Drain

Hercules RetroDrains, the industry’s most popular retrofit drain, are available in 80 mm, 100 mm, 125 mm and 150 mm sizes and with a variety of options to support any project, including OMG’s exclusive Vortex Breaker Strainer Dome, which can increase flow by up to 2.5 times (see Hercules-Plus), and with a TPO or PVC coated flange for direct membrane attachment.

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Features & Benefits

Features & Benefits

  • Saves time and money by allowing easy installation from the rooftop without disturbing occupants.
  • Cast aluminum strainer dome and clamping ring that will not rust for long term durability and performance.
  • U-Flow Seals exceed the ANSI/SPRI RD1 standard for a secure, watertight connection.
Product Use

Product Use

Hercules RetroDrains are designed to replace existing new construction drains in re-roofing applications. Installed from the roof surface, Hercules RetroDrains are engineered to be installed without removing the existing drain fixture. Hercules RetroDrains have a mechanical seal for direct connection to existing PVC or cast iron plumbing.

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

Technical Data

Technical Data

Drain Body:  3.2 mm (0.125-in.) spun aluminum
Seal:  Watertight U-Flow mechanical seal (requires U-Flow screwdriver for installation)
Flange:  445 mm (17.5-in.) diameter with sump area. TPO and PVC coated options available.
Strainer Dome:  Cast aluminum or aluminum SuperDome
Stem:  305 mm (12-in.) length
Clamp Ring:  Cast aluminum where applicable. *Not provided on TPO or PVC coated drains. 

Performance Data

Performance Data

Flow Rates in Litres Per Second (l/s)

  Head Height of Water
Model 50 mm 75 mm 100 mm 125 mm
75 mm Clamp Ring Hercules 1.77 mm 2.9 mm 4.29 mm 5.05 mm
100 mm Clamp Ring Hercules 4.23 mm 5.49 mm 7.82 mm 9.91 mm
125 mm Clamp Ring Hercules 4.92 mm 9.27 mm 17.54 mm 24.35 mm
150 mm Clamp Ring Hercules 4.48 mm 8.52 mm 12.93 mm 14.57 mm
Packaging Info

Packaging Info

Aluminum Hercules

Cat. No. Description Size (mm) Packaging Quantity Dimensional Weight (Kg)
HDAL3A Aluminum Herc. w/ Clamping Ring 75 Each 12.2
HDAL4A Aluminum Herc. w/ Clamping Ring 100 Each 12.2
HDAL5A Aluminum Herc. w/ Clamping Ring 125 Each 12.2
HDAL6A Aluminum Herc. w/ Clamping Ring 150 Each 12.2

TPO Coated Hercules

Cat. No. Description Size (mm) Packaging Quantity Dimensional Weight (Kg)
HDTPO3A Herc. w/ TPO Coated Flange 75 Each 12.2
HDTPO4A Herc. w/ TPO Coated Flange 100 Each 12.2
HDTPO5A Herc. w/ TPO Coated Flange 125 Each 12.2
HDTPO6A Herc. w/ TPO Coated Flange 150 Each 12.2

PVC Coated Hercules

Cat. No. Description Size (mm) Packaging Quantity Dimensional Weight (Kg)
HDPVC3A Herc. w/ PVC Coated Flange 75 Each 12.2
HDPVC4A Herc. w/ PVC Coated Flange 100 Each 12.2
HDPVC5A Herc. w/ PVC Coated Flange 125 Each 12.2
HDPVC6A Herc. w/ PVC Coated Flange 150 Each 12.2

Copper Hercules

Cat. No. Description Size (mm) Packaging Quantity Dimensional Weight (Kg)
HDCU3A Copper Herc. w/ Clamping Ring 75 Each 12.2
HDCU4A Copper Herc. w/ Clamping Ring 100 Each 12.2
HDCU5A Copper Herc. w/ Clamping Ring 125 Each 12.2
HDCU6A Copper Herc. w/ Clamping Ring 150 Each 12.2