Olympic Manufacturing 4 in. Hercules Cast Aluminum RetroDrain - image 1

Olympic Manufacturing 4 in. Hercules Cast Aluminum RetroDrain

Regular price $571.81

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Olympic Manufacturing 4 in. Hercules Cast Aluminum RetroDrain


The Olympic Manufacturing Hercules 4 in. RetroDrain is a cast aluminum roof drain for retrofit drainage applications, sold as one drain. It carries ANSI/SPRI RD-1 and ULC/ORD-C790.4 applicable standards and weighs 27 lb. Install it with compatible Olympic drain accessories and membrane flashing per manufacturer instructions.


Key Features:

  • 4 in. retrofit drain: Designed as a 4 in. Hercules RetroDrain for retrofit roof drainage.
  • Cast aluminum body: Body is cast aluminum for strength and corrosion resistance.
  • Standards listed: Applicable standards: ANSI/SPRI RD-1 and ULC/ORD-C790.4.
  • Heavy-duty weight: Item weight is 27 lb, reflecting the cast-metal construction.
  • RetroDrain design: Hercules RetroDrain series for retrofit drain replacement.
  • Single-drain unit: Sold individually, one drain per selling unit.

Specifications Table:

Specification Details
Brand Olympic Manufacturing
Sell unit 1 drain
Product line Hercules RetroDrain
Nominal size 4 in.
Material Aluminum
Applicable standards ANSI/SPRI RD-1; ULC/ORD-C790.4
Weight 27 lb
Algae resistance No
Intended use Retrofit roof drainage

Fit and Compatibility:

Part of the Olympic Manufacturing Hercules drain line as a 4 in. cast aluminum RetroDrain. Membrane flashing, clamping components or sump accessories, if required, are sold separately; follow the manufacturer's installation instructions.


Frequently Asked Questions (FAQ):

Q: What is included with this item?
A: One 4 in. Hercules cast aluminum RetroDrain; ancillary flashing or clamping parts are sold separately.


Q: What size drain is this?
A: It is a 4 in. RetroDrain; verify pipe and membrane sizing before ordering.


Q: What is it made of?
A: Cast aluminum, which provides strength and corrosion resistance.


Q: What standards does it meet?
A: Applicable standards listed are ANSI/SPRI RD-1 and ULC/ORD-C790.4.


Q: How heavy is the drain?
A: The item weighs 27 lb, so plan for safe handling during installation.


Expert Verdict — Reviewed by the SuperArbor Pro Desk

RetroDrains are used when replacing existing drains without tearing out the full sump, so confirm the existing drain's size and connection type before ordering the 4 in. aluminum unit. Set the new drain to the correct height relative to insulation and membrane, and flash it per the membrane manufacturer's details and local code.

A 27 lb cast-metal drain is heavy and openings in the roof deck are a fall hazard; use safe lifting practices and barricade or cover open sumps during installation.


Order the Olympic Manufacturing 4 in. Hercules Cast Aluminum RetroDrain for your retrofit roof drainage project.

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Subject to Approval & Availability
All orders are reviewed before fulfillment. You are not charged until your order is approved and ready to ship — and you may cancel at any time before that at no cost.

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