Heavy Duty TPO RetroDrain

The one-piece spun aluminum body has a TPO coated flange for direct hot air welding of TPO roof membranes. The drain flange has a depressed sump area for improved flow and to faciliate drainage. The TPO RetroDrain is equipped with a heavy duty cast aluminum strainer dome for strength and durability, and incorporates U-Flow® Seal technology, providing a mechanical watertight connection to PVC or cast iron pipes. Available in 3-in., 4-in., 5-in., and 6-in. sizes.

Features & Benefits

  • One-piece seamless body manufactured from 0.125-in., 11 gauge spun aluminum.
  • Extra large 17 1/2-in., TPO coated flange.
  • Sump area.
  • Flange has welded metal clips for dome attachment.
  • 12-in. long drain stem designed to bypass the existing drain bowl right to the water leader.
  • Incorporates U-Flow Seal technology for a secure, watertight connection.
  • Simple and easy to install.
  • Also available with a plastic strainer dome.


For detailed drawings, click here. For 3-Part Specifications, click here.

Physical Data
Ordering Info
Downloads & Videos


OlyFlow RetroDrains 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.

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

Physical Data

The data below is constant for each Heavy Duty TPO RetroDrain.

Drain Body 11 gauge (.125-in.) spun aluminum
Seal Watertight U-Flow mechanical seal (requires U-Flow screwdriver)
Flange 17½-in. diameter TPO coated with sump area
Strainer Dome Cast aluminum or plastic
Stem 12-in. length

Ordering Information

SKUSize (in.)PackagingWeight (lbs.)
HDTPO3A 3 Each 32
HDTPO4A 4 Each 32
HDTPO5A 5 Each 32
HDTPO6A 6 Each 32

Go back

Product 4 of 24

Superior productivity. Superior performance.