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Zurn Z420 - Deep Shank Floor and Shower Drain for Marble and Granite Applications

Zurn Z420 - Deep Shank Floor and Shower Drain for Marble and Granite Applications

Zurn Z420 - Deep Shank Floor and Shower Drain for Marble and Granite Applications

$1,116.98


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SKU ZN420-2NH

The Zurn Z420 is a deep shank floor and shower drain engineered specifically for marble, granite, and other thick or premium floor systems. It delivers robust drainage performance while accommodating deeper floor construction and high-end finishes.

Key Features

  • Deep Shank Design
    The extended shank length allows it to integrate seamlessly with thicker floor finishes, making it ideal for installations using heavy stone, tile, or other dense materials.

  • Adjustable Head & Secure Strainer
    Equipped with a polished nickel-bronze adjustable head and a 4″ round secured strainer (standard), allowing precise alignment with the finished surface and protecting against debris ingress.

  • Membrane Clamp & Seepage Slots
    The invertible membrane clamp with surrounding seepage slots supports waterproofing continuity and edge drainage, helping prevent leaks and supporting clear flow under various floor tolerances.

Downloads:

Product Codes: Z420-2NH, Z420-3NH, Z420-4NH, Z420-6NH, Z420-2NL, Z420-3NL, Z420-4NL, Z420-2IP, Z420-3IP, Z420-4IP, Z420-2IC, Z420-3IC, Z420-4IC, Z420-2IG, Z420-3IG, Z420-4IG, ZB420-2NH, ZB420-3NH, ZB420-4NH, ZB420-2NL, ZB420-3NL, ZB420-4NL, ZB420-2IP, ZB420-3IP, ZB420-4IP, ZB420-2IC, ZB420-3IC, ZB420-4IC, ZB420-2IG, ZB420-3IG, ZB420-4IG, ZN420-2NH, ZN420-3NH, ZN420-4NH, ZN420-2NL, ZN420-3NL, ZN420-4NL, ZN420-2IP, ZN420-3IP, ZN420-4IP, ZN420-2IC, ZN420-3IC, ZN420-4IC, ZN420-2IG, ZN420-3IG, ZN420-4IG

Frequently Asked Questions

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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 Z420 – Deep Shank Floor & Shower Drain for Marble and Granite

Purpose-built for thick stone finishes, the Zurn Z420 features a deep shank (extended threaded riser) and a finish-friendly strainer assembly that aligns neatly with marble, granite, and stone slab installations.

In technical terms, the Z420 pairs an extended threaded shank for added adjustment range with a clamping interface and weep/seepage paths to tie in membranes and mortar beds. It’s a stone-floor drain that reaches through thicker assemblies, protects the waterproofing, and keeps the grate perfectly flush.

Zurn Z420 deep shank drain schematic showing extended threaded shank, clamp interface, and strainer assembly
Z420 – Dimensional & Component Schematic

Key Features

  • Deep shank (extended threaded riser) for thick marble/granite assemblies—more vertical adjustment to hit final elevation.
  • Clamp-style waterproofing interface with seepage/weep paths to protect finishes from trapped moisture.
  • Adjustable strainer/head to dial in a flush, trip-safe surface on stone tiles or slabs.
  • Rugged cast-iron body (Zurn Dura-Coated family) designed for long-term commercial service.
  • Outlet compatibility with common connection families; confirm type/size on the submittal.

Where Z420 Excels

Ideal for luxury showers, spa/wet areas, hotel guest baths, and public lobbies using stone finishes. The deep shank reaches through thick mud beds and stone, while the clamping collar simplifies membrane tie-in.

Benefits

  • More adjustment to meet stone thickness without shims or field hacks.
  • Cleaner finish—strainer sits perfectly flush with marble or granite.
  • Fewer callbacks—weep paths help manage incidental moisture below the stone.
Zurn brand logo
Zurn – Stone-Finish Drainage

Specifications at a Glance

Type: Deep-shank floor/shower drain for marble & granite

Body: Dura-Coated cast iron (commercial-duty)

Interface: Clamping collar with weep/seepage paths

Top: Adjustable strainer/head for flush alignment

Applications: Luxury showers, spas, hotel baths, stone-finish lobbies

Verify: Dimensions, outlet type/size, and furnished options on project submittal

Tip: Pre-plan stone thickness and mortar bed so the deep shank’s adjustment range lands in the middle—not at the extremes.

Installation Highlights

1) Rough-In to Depth

Set the body so the deep shank has mid-range adjustment once the mud bed and stone are placed.

2) Waterproof & Weeps

Tie the membrane into the clamp collar. Keep weep holes clear to prevent moisture buildup under stone.

3) Final Set & Polish

Adjust the head to sit flush with marble/granite; protect the finish during grouting and cleanup.

Case Study: Boutique Hotel Spa Showers

A boutique hotel specified 2 cm marble shower floors over a sloped mortar bed. The Zurn Z420 provided the extra adjustment to bridge the stone thickness while the clamping collar and weep paths protected the assembly. Punch-list alignment was spot on, and facilities reported smooth cleanouts with no edge staining at the drains.

Frequently Asked Questions

Why a “deep shank” for stone floors?
Stone and mud beds are thicker than typical tile assemblies. The deep shank gives more thread engagement so you can reach final height without shims.
Do I still need weep protection?
Yes. Keep the weep holes clear and use pea gravel/weep protectors at the clamp to let incidental moisture escape under the stone.
Will the top sit flush with thick marble?
The adjustable head is designed to align with thicker finishes. Plan your mortar bed so the shank’s travel lands mid-range for easier fine-tuning.