Roof Drain Identification Guide

Find the Right Roof Drain

No part number? No problem. Take three simple measurements, check the manufacturer color, and we'll help you find the correct drain or replacement part.

Start With 3 Simple Measurements

Grab a tape measure and measure in inches.

1

Measure the Metal Ring

Measure straight across the entire ring from outside edge to outside edge.

Ring Outside Diameter (OD)
2

Measure Bolt-to-Bolt

Measure from the center of one bolt to the center of the bolt directly across from it.

Center-to-Center
3

Measure the Dome

Measure across the widest part of the dome or strainer from outside edge to outside edge.

Dome Outside Diameter (OD)
Important: Correct measurements help prevent ordering the wrong replacement part. If you send us photos, leave the tape measure visible so our team can clearly see the measurement.

Do You Recognize the Brand?

Color can help identify the manufacturer. If you recognize your brand, click it below to start shopping.

Color is a helpful clue, but always confirm measurements and manufacturer markings before ordering.

Still Not Sure What You Have?

Send our team these 5 things and we'll help identify the drain.

  • A photo of the complete roof drain
  • A close-up photo of the ring or collar
  • The outside diameter of the ring
  • The center-to-center bolt measurement
  • The outside diameter of the dome

Ready to Shop?

Choose the option that best matches what you need.

Still Not Sure? Let Our Team Help.

Send us your photos and measurements. A Big Rock Supply team member can help identify what you have and point you toward the correct replacement.

Contact a Team Member

Best Sellers

Josam Style #410 Clamp Post Package
Clamps Josam 414, 415, 416, 418 Roof Drains, 4 clamps & bolts per pack
Price: $22.95

A package containing four clamp posts and bolts designed to secure Josam 414, 415, 416 and 418 roof drains. Key features: Includes four clamps and bolts per pack Designed for securing roof drains in multiple membrane types Also available in XL Package

Wade Style 3/8 "L" Hookbolt Package
(1968-1982) for 3000 & 3100 Series Drains
Price: $18.20

This hardware package includes four 3/8″ “L” hookbolt fasteners designed for Wade 3000 and 3100 Series roof drains manufactured between 1968 and 1982. These replacement bolts provide a secure fit for clamp rings and drainage components in compatible roof drain systems. Key features: Four 3/8″ “L” hookbolt fasteners per package Designed for Wade 3000 and 3100 Series roof drains Ideal replacement hardware for 1968–1982 models Provides reliable fastening for drain clamp assemblies ...

Josam Style #410XL Clamp Post Package
Drain Clamp
Price: $39.95

This is the Josam Style 410XL clamp post package designed to secure roof drains to a variety of roofing membranes and configurations. The kit includes four clamp posts and bolts. It accommodates materials such as asphalt, EPDM, PVC, and TPO. Key features: Includes 4 clamps and bolts Designed for securing roof drains Compatible with multiple membrane types (asphalt, EPDM, PVC, TPO) XL version for extended reach or thicker assemblies Simple installation and replacement ...

Olyflow - Uflow Hercules RetroDrain w/Cast Alum Dome
Patented U-Flow Seal Provides Watertight Connection. (Requires U-Flow Screwdriver)
Price: $335.00

The OMG Hercules Aluminum RetroDrains (SKUs HDAL3A, HDAL4A, HDAL5A, HDAL6A) are durable retrofit roof drains designed to replace existing drains in re-roofing projects without removing the existing drain fixture. Each drain features a one-piece spun aluminum body, heavy cast aluminum strainer dome, large flange for secure membrane attachment, and a U-Flow mechanical watertight seal that connects reliably to existing plumbing (PVC or cast iron). These drains meet multiple codes and standards...

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