OMG Hercules-Plus PVC-Coated Vortex RetroDrain 3–6 in (HDPVC3V–HDPVC6V)

The HDPVC3V, HDPVC4V, HDPVC5V, and HDPVC6V models are the PVC-coated, vortex breaker versions of OMG’s Hercules-Plus RetroDrains, covering 3-inch through 6-inch sizes. Each unit includes a PVC-coated flange designed for direct heat welding to PVC roof membranes, a vortex breaker dome that enhances drainage flow (up to 2.5×), and a U-Flow mechanical seal for watertight connection to existing piping. These drains retrofit over existing drains from the roof surface without disturbing the plumbing below.

Key Features

• available in 3-, 4-, 5-, and 6-inch sizes (HDPVC3V–HDPVC6V)
• PVC-coated flange allows direct membrane welding to PVC roofing
• integrated vortex breaker dome increases drainage performance (up to 2.5×)
• includes U-Flow mechanical seal for watertight connection
• installs from the roof surface without disturbing existing drain plumbing

• item numbers: HDPVC3V, HDPVC4V, HDPVC5V, HDPVC6V
• body material: 11 gauge (0.125 in) spun aluminum 
• flange: 17.5-inch diameter with depressed sump area 
• stem length: 12 inches 
• dome: cast aluminum vortex breaker, safety yellow finish 
• seal: U-Flow mechanical seal, requires U-Flow screwdriver 
• packaging weight: approx. 27 lbs per unit

• Remove the old dome, clamping ring, and clear debris so the flange seats flush.
• Insert the U-Flow seal into the stem and lightly tighten screws to stabilize the seal.
• Set the assembled drain into the existing drain pipe until flange rests on the membrane.
• Heat-weld the PVC roofing membrane directly to the PVC-coated flange per membrane manufacturer instructions.
• Use the U-Flow screwdriver to tighten seal screws alternately until the seal fully expands and locks.
• Secure flange to roof deck using suitable fasteners and flash or cover as required.
• Mount the vortex breaker dome and ensure correct alignment and a stable fit.

Q: What sizes are offered in the HDPVC-coated vortex breaker series?
A: 3-inch (HDPVC3V), 4-inch (HDPVC4V), 5-inch (HDPVC5V), and 6-inch (HDPVC6V) models.

Q: What is the advantage of the PVC-coated flange?
A: It allows direct heat welding of PVC roofing membranes to the flange, creating a seamless, secure membrane connection.

Q: How does the vortex breaker improve performance?
A: It accelerates drainage, improving flow up to 2.5× compared to standard domes, and reduces turbulence or “chugging.”

Q: Does each model include a watertight seal?
A: Yes, each unit includes the U-Flow mechanical seal for secure, leak-resistant connection to existing pipes.

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