Sioux Chief D523 Combo Roof Dr...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$816.02
Sioux Chief D523 Combo Roof Drain and Overflow with Cast Iron Dome, 15" Diameter

Sioux Chief D523 Combo Roof Drain and Overflow with Cast Iron Dome, 15" Diameter

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Model: 868-D523

In Stock (leaves warehouse same day if ordered before 3pm ET)

$816.02
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Sioux Chief D523 Combo Roof Drain and Overflow with Cast Iron Dome, 15" Diameter

The Sioux Chief D523 Combo Roof Drain and Overflow is a rough-in plumbing fitting designed for flat roofs where an overflow drain is required in combination with a standard roof drain. This combo unit features a 15" diameter cast iron dome (CI DM) and a 3" no-hub (3NH) outlet connection for tie-in to cast iron drain-waste-vent piping. A 4" high internal water dam for the overflow fixture is standard and can be cut or shortened on-site to match the specific overflow elevation required by the installation. This configuration allows a single roof penetration assembly to serve both primary drainage and secondary (overflow) drainage functions, a common requirement on commercial flat-roof systems.

Key Features

  • Dome Diameter: 15" diameter cast iron dome strainer sized for flat-roof drainage applications.
  • Outlet Connection: 3" no-hub (3NH) outlet for direct connection to cast iron no-hub drain-waste-vent piping.
  • Durable Construction: Cast iron dome (CI DM) construction built for exposed rooftop service and long-term durability.
  • Internal Water Dam: 4" high internal water dam creates the overflow fixture threshold and is field-adjustable — it can be cut or shortened per job-specific specifications.
  • Combination Design: Combines a standard roof drain and an overflow drain in a single body for flat-roof installations where both primary and secondary drainage are required.
  • Application-Specific: Intended for use on flat roofs only, where code or design calls for a dedicated overflow drainage path alongside the primary roof drain.

Technical Specifications

  • Country of Origin: China
  • Cubic Volume: 3.3359031
  • Packaging: 1 EA
  • Dome Diameter: 15" Diameter
  • Outlet Size/Connection: 3" No-Hub
  • Water Dam Height: 4" (field-adjustable)

Typical Applications

  • Flat Commercial Roof Drainage Systems
  • Combined Primary and Overflow Roof Drain Installations
  • New Construction Rough-In Roof Drainage
  • Cast Iron No-Hub Drain-Waste-Vent Tie-Ins
  • Renovation of Flat-Roof Drainage Assemblies

Why Sioux Chief?

Sioux Chief manufactures this combo roof drain and overflow with a cast iron dome and 3" no-hub outlet built to stand up to continuous rooftop exposure. The field-adjustable 4" internal water dam gives installers the flexibility to set the overflow threshold to the specifications of the job, making this D523 combo unit a practical, code-oriented choice for flat-roof drainage rough-in work.

Note: This product carries a California Proposition 65 warning. Refer to the manufacturer's documentation for complete details.

Manufacturer Resources

Product Specs

Product Type:
Roof Drain
Connection Type:
No-Hub
Configuration:
Combination Roof Drain with Overflow
Country of Origin:
China
Department:
Plumbing
Product Group:
Rough-In and Supports
Product Subgroup:
Drains and Cleanouts
Product Material:
Cast Iron
Product Size:
15"

Sioux Chief 868-D523 – Frequently Asked Questions

1) Does the Sioux Chief D523 roof drain handle both the primary and the overflow drain, or do I need a second drain nearby?
One body does both. The D523 combines a standard roof drain and an overflow drain in a single assembly, so a single roof penetration serves primary drainage and secondary (overflow) drainage. That is what the internal water dam is for: it sets the threshold water must reach before the overflow path takes over. On flat commercial roofs where the design calls for a dedicated secondary path, this saves you cutting and flashing a second penetration.
2) What size and type of pipe does the D523 roof drain connect to?
The outlet is 3 inch no-hub, so it bands directly to 3 inch no-hub cast iron DWV piping with a standard no-hub coupling. If the leader on your drawing is hub-and-spigot or plastic, you will need the appropriate transition coupling at the outlet, because the drain itself gives you a no-hub spigot and nothing else.
3) Can the 4 inch water dam height on the D523 be changed to match my overflow elevation?
Yes. The internal water dam ships 4 inches high and is field-adjustable, so it can be cut or shortened on site to the overflow elevation the job calls for. You cannot make it taller, so if your design needs an overflow threshold above 4 inches, this is not the right unit.
4) Is the Sioux Chief D523 suitable for a sloped or pitched roof?
No. The D523 combo drain is intended for flat roofs only, where code or the design calls for an overflow path alongside the primary drain. For a pitched or sloped roof assembly, you want a drain designed for that application rather than this flat-roof combo unit.
5) How big is the dome on the D523 and what is it made of?
It is a 15 inch diameter cast iron dome strainer. Cast iron holds up to continuous rooftop exposure and foot traffic better than plastic domes, which is why it gets specified on commercial flat roofs. Check the 15 inch footprint against your roof sump and insulation layout before you set the drain.
6) What is the exact part number to order for the Sioux Chief combo roof drain with cast iron dome and 3 inch no-hub outlet?
Order Sioux Chief 868-D523. That is the combo roof drain and overflow with the 15 inch cast iron dome and 3 inch no-hub outlet, sold one each.
7) Can the D523 be used on a flat-roof drainage retrofit, or is it new construction only?
Both. Typical applications include new construction rough-in and renovation of existing flat-roof drainage assemblies. On a retrofit the two things that decide it are whether your existing leader is 3 inch no-hub cast iron and whether the sump will take the 15 inch dome.
8) Is there a Prop 65 warning on the Sioux Chief D523 roof drain?
Yes, the D523 carries a California Proposition 65 warning. Refer to Sioux Chief's documentation for the full wording if your jurisdiction or submittal package requires it to be recorded.
How fast can I get the Sioux Chief 868-D523 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Sioux Chief 868-D523 come with a warranty?
Absolutely. The Sioux Chief 868-D523 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Sioux Chief 868-D523?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Sioux Chief 868-D523 from ZenSupply?
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