OMG Hercules-Plus TPO-Coated RetroDrain with Vortex Breaker 3–6 in (HDTPO3V–HDTPO6V)

The legion of HDTPO3V, HDTPO4V, HDTPO5V, HDTPO6V comprises the TPO-flanged versions of OMG’s Hercules-Plus Vortex Breaker RetroDrains, spanning 3-inch through 6-inch sizes. These drains combine durable spun aluminum bodies with a TPO-coated flange for direct membrane welding, and include the integrated vortex breaker dome to boost flow (up to 2.5×). Each unit also includes the U-Flow mechanical seal for a watertight connection to existing piping, enabling rooftop retrofit without disturbing underlying plumbing.

Key Features

• available in 3-, 4-, 5-, 6-inch sizes (HDTPO3V–HDTPO6V)
• direct TPO-coated flange for hot-air welding to membrane
• integrated vortex breaker dome increases drainage efficiency (up to 2.5×)
• includes U-Flow mechanical seal for secure, watertight connection
• installs from roof surface, no need to remove existing drain piping
• safety yellow cast aluminum dome for visibility

• item numbers: HDTPO3V, HDTPO4V, HDTPO5V, HDTPO6V
• drain sizes: 3", 4", 5", 6"
• body material: 11 gauge (.125") spun aluminum 
• flange diameter: 17.5" with sump area 
• dome: cast aluminum vortex breaker, safety yellow finish 
• stem length: 12" 
• seal: U-Flow mechanical compression seal (requires U-Flow screwdriver) 
• coating: TPO membrane-weldable flange (TPO coating on flange) 
• flow performance: up to 2.5× greater water flow vs. original Hercules drains 
• packaging weight: 27 lbs each (dimensional)

• Remove any existing strainers, clamping rings, or flange assemblies so the drain area is clean and flush.
• Insert the U-Flow seal into the drain stem and partially tighten screws to hold the seal.
• Position the drain body into the existing pipe until the flange lies flat against the roof membrane.
• Hot-air weld the TPO membrane to the TPO-coated flange per membrane manufacturer instructions.
• Use the U-Flow screwdriver to tighten seal screws alternately until the seal fully expands and locks into place.
• Secure the flange to the deck with fasteners; flash and cover fastener heads per roofing specification.
• Attach the vortex breaker dome, ensuring proper alignment and a secure fit.

Q: What sizes are offered in the HDTPO-flanged vortex breaker line?
A: The line includes 3", 4", 5", and 6" sizes (HDTPO3V, HDTPO4V, HDTPO5V, HDTPO6V).

Q: What is the benefit of the TPO-coated flange?
A: It allows the membrane to be welded directly to the drain flange for a seamless, watertight interface.

Q: How much of an increase in flow does the vortex breaker provide?
A: It can improve drainage flow by up to 2.5× compared to standard non-vortex models.

Q: Does each HDTPOV unit include a U-Flow seal?
A: Yes, every unit includes a watertight U-Flow mechanical seal.

Q: Can these be installed without removing existing plumbing?
A: Yes, they are designed for rooftop retrofit installation without disturbing the existing piping below.

Q: What is the material of the dome and body?
A: The dome is cast aluminum with a safety yellow finish; the body is spun aluminum.