O-Ring Drains

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2" RetroDrain, 8" RetroDrain

The O-Ring RetroDrain is designed for use in existing drain leaders smaller than 3-inces and larger than 6-inches. The drain features an aluminum body with an extra large flange for positive attachment of the roof flashing membrane and four rubber O-rings to make a watertight seal. It’s available with either a U-Flow cast aluminum strainer dome and cast aluminum clamping ring, cast aluminum SuperDome, plastic dome or a RAC aluminum strainer dome. The most common sizes are the 2-in. and 8-in., but other sizes available on a custom made basis.

Features & Benefits

  • Simple and easy to install from rooftop in 15 to 30 minutes.
  • O-Ring RetroDrains have a one-piece, seamless body.  This eliminates the possibility of leaks due to poor welds at the stem and flange connection.
  • Extra large flange for positive attachment of the roof flashing membrane.
  • Drain stem accomodates most existing field connections or can be field cut to accomodate quick turn elbows.
  • Two rubber O-rings make a dependable watertight seal.
  • Available with either a U-Flow cast aluminum strainer dome or a cast aluminum SuperDome. They can also be retrofitted with the yellow Vortex Breaker Strainer dome. All models have the appropriate aluminum clamping ring.
  • Saves time and money by allowing easy installation from the rooftop without disturbing occupants.
Physical Data
Ordering Info
Downloads & Videos


OlyFlow RetroDrains are designed to replace existing drains in re-roofing applications. Installed from the roof surface, the 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

Drain Body (2-in.) 16 gauge (.064-in.) spun aluminum
Drain Body (8-in.) 11 gauge (.125-in.) spun aluminum
Seal 2 rubber O-rings
Flange 17 1/2-in. diameter
Strainer Dome Cast aluminum, SuperDome cast aluminum
Stem 12-in. length
Clamp Ring Cast aluminum, SuperDome cast aluminum

Ordering Information

SKUDomeSize (in.)PackagingWeight (lbs.)
ALDCR8A Aluminum 8 Each 32
ALDCR2A Aluminum 2 Each 32

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