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Zurn Z521 - 12" Adjustable Heavy-Duty Drain

Zurn Z521 - 12" Adjustable Heavy-Duty Drain

Zurn Z521 - 12" Adjustable Heavy-Duty Drain

$3,120.75


FREE SHIPPING
SKU Z521-2NH

The Zurn Z521 area drain is engineered for durability, performance, and flexibility in demanding surface drainage applications. Ideal for plazas, paved areas, industrial decks, and high-flow exterior or interior zones, it supports robust water management in tough conditions.

Key Features

  • Heavy-Duty Construction
    Built with materials and finishes designed to resist corrosion, mechanical stress, and long-term environmental exposure.

  • Traffic-Capable Grate
    Features a load-rated grate suitable for foot traffic and vehicular loads while maintaining efficient water intake.

  • Outlet & Waterproofing Integration
    Comes with connection options and sealing features to interface cleanly with piping systems and waterproofing membranes in paving or deck construction.

Downloads:

Product Codes: Z521-3NH, Z521-4NH, Z521-6NH, Z521-3IC, Z521-4IC, Z521-6IC, Z521-3IG, Z521-4IG, Z521-6IG, Z521-4IP, Z521-6IP, Z521-4NL, and prefixed versions: ZB521-3NH, ZB521-4NH, ZB521-6NH, ZB521-3IC, ZB521-4IC, ZB521-6IC, ZB521-3IG, ZB521-4IG, ZB521-6IG, ZB521-4IP, ZB521-6IP, ZB521-4NL, ZN521-3NH, ZN521-4NH, ZN521-6NH, ZN521-3IC, ZN521-4IC, ZN521-6IC, ZN521-3IG, ZN521-4IG, ZN521-6IG, ZN521-4IP, ZN521-6IP, ZN521-4NL

Frequently Asked Questions

View Our Full Selection of Zurn Drains →

Shipping

  • All items ship for free (standard ground, see map)
  • Call: (800) 604-5537 for pricing and shipping questions. Shipping estimates shown on the map pertain to this specific product only.
  • Orders typically ship in 1-3 business days. Transit times displayed in the map are listed in business days, and are approximate. The day that the order is shipped is not counted as a transit day.
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Zurn Z521 – 12" Adjustable Heavy-Duty Drain

A 12-1/4" (nom.) adjustable heavy-duty area drain featuring a Dura-Coated cast-iron body with bottom outlet, seepage pan, and a membrane flashing clamp with seepage holes—topped by a heavy-duty tractor grate and an adjustable extension frame for precise finish elevation.

In technical terms, the Zurn Z521 is built to anchor into structural slabs, integrate cleanly with waterproofing, and withstand frequent wheel loads. In plain English: it’s a rugged, serviceable drain that lets you dial in grate height at the very end so you can match pavers, overlays, or toppings without re-setting the body.

Zurn Z521 adjustable heavy-duty drain schematic with clamp, seepage pan, and adjustable frame
Z521 – Dimensional & Adjustment Schematic

Key Features

  • 12-1/4" diameter top with heavy-duty tractor grate for high-traffic surfaces.
  • Adjustable extension frame allows precise finish-grade alignment after pours or paver set.
  • Dura-Coated cast-iron body with bottom outlet for long service life.
  • Membrane flashing clamp (with seepage holes) + seepage pan streamline waterproofing tie-in.
  • Open area ≈ 30 in²; approx. weight ≈ 60 lb (config-dependent).

Where Z521 Excels

Specify Z521 for parking decks, ramps, plazas, loading zones, and industrial slabs where height adjustability and robust inflow are critical. The tractor grate resists rocking and impact, while the adjustable frame helps eliminate trip edges at the final surface.

Outlets, Sizes & Finishes

  • Outlet families: NH No-Hub (2", 3", 4", 6", 8"), NL Neo-Loc (2", 3", 4"), IC Inside Caulk (3", 4", 6"), IG Inside Gasket (3", 4", 6"), IP Threaded (4", 6").
  • Top finishes (prefix): Z (cast iron), ZB (polished bronze), ZN (polished nickel-bronze).
  • Popular options: -DG Duresist ductile-iron grate, -TS top secured, -VP vandal-proof, -Y sediment bucket, -T square top, -S secondary strainer, -TC Neo-Loc test cap.
Zurn brand logo
Zurn – Engineered Drainage for Demanding Sites

Specifications at a Glance

Top: 12-1/4" round, heavy-duty tractor grate

Body: Dura-Coated cast iron; bottom outlet

Waterproofing: Seepage pan + membrane clamp w/ seepage holes

Adjustability: Extension frame for finish-grade tuning

Outlet types: NH / NL / IC / IG / IP (sizes per family; see above)

Open area / weight: ≈30 in²; ≈60 lb (verify per submittal)

Always confirm final dimensions, load rating, outlet, and accessories on the project submittal.

Installation Highlights

1) Set & Anchor

Seat the drain body at rough elevation; anchor per detail; ensure positive slope toward the drain.

2) Waterproofing Tie-In

Integrate the seepage pan and clamp with the membrane; protect the assembly during pours/overlays.

3) Adjust & Commission

Use the adjustable frame to set final height flush with finishes; install/secure the grate; schedule debris checks before heavy rain or freeze-thaw cycles.

Case Study: Plaza Overlay & Grade Alignment

A civic plaza received a traffic-bearing overlay over a waterproof deck. Crews selected Zurn Z521 drains with 4" No-Hub outlets, -DG tractor grates, and -TS secured tops. The adjustable frame let installers dial in grate height after overlay placement—eliminating trip edges. After one rainy season, maintenance logs showed faster drawdown and fewer downstream jetting calls, especially at leaf-prone corners outfitted with -Y sediment buckets.

Frequently Asked Questions

What does “adjustable” mean on Z521?
The extension frame lets you fine-tune grate elevation at finish—ideal for matching pavers, overlays, or slope corrections without re-setting the drain body.
Which outlet should I specify?
Match the system: No-Hub (NH) for cast-iron, Neo-Loc (NL) for compression, Threaded (IP) for steel, or Inside Caulk (IC)/Inside Gasket (IG) as detailing requires. Sizes vary by outlet family (see above).
Are architectural tops available?
Yes—use prefixes ZB (polished bronze) or ZN (polished nickel-bronze) for finished spaces; base prefix Z is cast iron.