OMG Hercules-Plus Aluminum RetroDrain with Vortex Breaker 3–6 In (HDAL3V–HDAL6V)

The OMG Hercules-Plus Aluminum RetroDrain with Vortex Breaker is a high-performance retrofit drain available in 3-inch, 4-inch, 5-inch, and 6-inch models (HDAL3V–HDAL6V). It combines a one-piece spun aluminum body with a large flange and the innovative vortex breaker dome for up to 2.5× greater flow than standard designs. The drain installs from the rooftop without disturbing existing plumbing and includes OMG’s watertight U-Flow mechanical seal for connection to existing pipes. Its safety yellow dome increases visibility and safety during inspection and maintenance.

Key Features

• available in 3-, 4-, 5-, and 6-inch sizes (HDAL3V–HDAL6V)
• integrated vortex breaker strainer dome increases flow up to 2.5×
• watertight U-Flow mechanical seal included
• one-piece spun aluminum body with 17.5-inch flange and depressed sump area
• installs from rooftop without removing existing drain lines
• bright yellow cast aluminum dome for high visibility

• item numbers: HDAL3V (3-inch), HDAL4V (4-inch), HDAL5V (5-inch), HDAL6V (6-inch)
• drain sizes: 3-inch, 4-inch, 5-inch, 6-inch
• body material: 11 gauge (0.125-inch) spun aluminum
• flange diameter: 17.5 inches (with depressed sump area)
• stem length: 12 inches
• dome material: cast aluminum, safety yellow finish, integrated vortex breaker design
• clamp ring: cast aluminum
• seal type: U-Flow mechanical compression seal (requires U-Flow screwdriver)
• flow performance: up to 2.5× higher discharge compared to standard dome designs
• installation type: retrofit from rooftop (no plumbing disturbance)
• weight per unit: approximately 27 lbs each
• packaging: 1 unit per box

• Remove existing drain dome, clamping ring, and any debris or membrane around the drain area.
• Insert the U-Flow mechanical seal into the drain stem and pre-tighten the screws to hold it.
• Place the assembled drain into the existing leader pipe until the flange sits flush with the membrane.
• Using the U-Flow screwdriver, tighten the seal screws alternately in sequence until the seal expands and locks in place.
• Secure the flange to the deck with fasteners through pre-punched holes and cover fastener heads with roofing membrane.
• Install the clamping ring and secure the bright yellow vortex breaker dome.
• Verify watertight fit and ensure water flow is unobstructed.

Q: What sizes are available for the Hercules-Plus Vortex Breaker RetroDrain?
A: The product line includes 3-inch (HDAL3V), 4-inch (HDAL4V), 5-inch (HDAL5V), and 6-inch (HDAL6V) sizes.

Q: What is the advantage of the vortex breaker dome?
A: It significantly improves water flow—up to 2.5× faster than standard domes—while reducing turbulence and “chugging.”

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

Q: Can the drain be installed without replacing the existing plumbing?
A: Yes; installation is entirely from the roof surface, with no need to disturb existing drain piping.

Q: What material is used for the dome and body?
A: The dome and clamp ring are cast aluminum, and the drain body is one-piece spun aluminum.

Q: Why is the dome yellow?
A: The safety yellow finish improves visibility on the rooftop and helps locate drains easily during inspection.