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Zurn Z130S - Siphonic Roof Drain W/Dura-Coated Cast Iron Drain Body + Air Baffle, Membrane Flashing Clamp and Deck Plate

Zurn Z130S - Siphonic Roof Drain W/Dura-Coated Cast Iron Drain Body + Air Baffle, Membrane Flashing Clamp and Deck Plate

Zurn Z130S - Siphonic Roof Drain W/Dura-Coated Cast Iron Drain Body + Air Baffle, Membrane Flashing Clamp and Deck Plate

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SKU Z130S

The Zurn Z130S is a siphonic roof drain built to maximize water removal using negative pressure flow. It is tailored for large roof areas where rapid drainage, minimized pipe sizing, and clean roof surfaces are crucial. Its design supports efficient conveyance of stormwater with fewer roof penetrations and reduced slope requirements.

*Please submit a quote request below for pricing and availability on this product.

Key Features

  • Siphonic Flow Design: Operates under full-bore flow conditions, allowing greater throughput with smaller diameter outlet piping and lower slopes.

  • Large Open Strainer/Dome Area: Facilitates rapid water intake without clogging, ensuring the siphon effect is not interrupted by debris.

  • Sturdy Construction & Secure Membrane Clamp: Built from durable materials with a reliable flashing clamp to maintain waterproofing integrity around roof membrane.

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Product Codes: Z130S-3NH, Z130S-4NH, Z130S-6NH, Z130S-3NL, Z130S-4NL, Z130S-6NL, Z130S-3IP, Z130S-4IP, Z130S-6IP, Z130S-3IC, Z130S-4IC, Z130S-6IC, Z130S-3IG, Z130S-4IG, Z130S-6IG,

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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 Z130S – Siphonic Roof Drain: An Overview

Dura-coated cast iron drain body with air baffle, membrane flashing clamp, and deck plate—built for efficient roof stormwater management.

For large commercial or institutional roofs, conventional gravity drains can require oversized piping, steep slopes, and numerous downspouts. The Zurn Z130S Siphonic Roof Drain solves this by using siphonic action to accelerate water removal. With its durable construction and integrated sealing components, it ensures reliable drainage performance even under extreme rainfall conditions.

Zurn Z130S Siphonic Roof Drain
Zurn Z130S – Siphonic Roof Drain

What Is the Z130S?

The Z130S is a siphonic roof drain designed to move water quickly using negative pressure (full-bore siphonic flow). Unlike gravity-only drains, siphonic drains reduce air entry, creating a vacuum that accelerates water through flatter, smaller-diameter piping systems.

Key Features & Benefits

  • Dura-Coated Cast Iron Body: Provides superior corrosion resistance and long service life.
  • Air Baffle: Manages air exclusion to maintain siphonic operation and prevent turbulence.
  • Membrane Flashing Clamp: Creates a watertight seal with the roofing membrane for leak protection.
  • Deck Plate: Ensures secure integration with the structural deck during installation.
  • Space-Efficient Design: Reduces the need for multiple downspouts and large pipe slopes.
Zurn Z130S Drain Schematic
Zurn Z130S – Schematic

Applications of the Z130S

  • Large flat roofs with limited slope availability
  • Commercial buildings where ceiling space is tight
  • Hospitals, schools, and institutional facilities
  • Retrofits requiring reduced pipe sizes and fewer downspouts

Installation Notes

  • Ensure the flashing clamp is evenly tightened to create a reliable membrane seal.
  • Confirm proper alignment of the air baffle to maintain siphonic performance.
  • Design horizontal runs nearly flat to maximize space savings.
  • Conduct water flow testing after installation to verify full-bore operation.
Zurn Z130S Drain Top View
Zurn Z130S – Top View

Case Study: Commercial Office Complex

Challenge: A downtown office building needed drainage upgrades on a wide, flat roof with minimal slope. Traditional gravity drains would have required oversized piping and numerous vertical downspouts.

Solution: Engineers installed Zurn Z130S Siphonic Roof Drains, designing a near-level piping layout that used fewer downspouts and reduced pipe diameters.

Outcome: The system performed efficiently during heavy storms, saving ceiling space and reducing material costs compared to a traditional system.

Conclusion

The Zurn Z130S Siphonic Roof Drain is a dependable, high-performance solution for commercial and institutional roofing projects. Its siphonic design, durable cast iron body, and integrated sealing features make it an excellent choice for modern stormwater management challenges.

Frequently Asked Questions

How does siphonic drainage differ from gravity drainage?

Siphonic drainage uses negative pressure and air exclusion to move water faster, allowing for smaller pipes and flatter runs.

Is the Z130S suitable for retrofit projects?

Yes, its design reduces the need for slope and can often fit into existing ceiling spaces without major changes.

What maintenance is recommended?

Routine inspections for debris and seal integrity will help maintain siphonic performance over time.