Zurn ZC121 12" Diameter Main Roof Drain - Cast Iron Dome

The Zurn ZC121 roof drain is built with a Dura-coated cast iron body designed for rooftop drainage. It includes a combination membrane flashing clamp and gravel guard, and accommodates multiple outlet types and dome variants for flexible installation.

Key Features

• 12-inch diameter Dura-coated cast iron body
• Combination membrane flashing clamp and gravel guard
• Low silhouette dome options (cast iron or poly)
• Available in multiple outlet types
• Supports accessory options like underdeck clamps and sump receivers

• Product / SKU: ZC121
• Body material: Dura-coated cast iron
• Drain diameter (bowl): 12 inches
• Dome types: low silhouette cast iron or poly dome (option dependent)
• Membrane clamp: combination flashing clamp with gravel guard
• Outlet types: No-Hub, Inside Caulk, Threaded (depending on order)
• Available pipe sizes: 2", 3", 4", 5", 6"

• Place drain body so the top flange aligns with or is slightly below the finished roof surface.
• Connect the drain outlet using the selected outlet type.
• Lay membrane flashing over the flange and secure under the clamp and gravel guard.
• Install the low silhouette dome (cast iron or poly) onto the body.
• If required, attach underdeck clamps, sump receiver, or accessories.
• Check for proper seating and seal before completing surrounding roof materials.

Q: What is the body of the ZC121 roof drain made of?
A: The body is Dura-coated cast iron.

Q: What is the diameter of the ZC121 drain?
A: The drain diameter is 12 inches.

Q: What dome types are available for the ZC121?
A: Dome options include low silhouette cast iron or poly domes.

Q: What outlet types are available?
A: Common options include No-Hub, Inside Caulk, and Threaded.

Q: What pipe sizes can the ZC121 handle?
A: The ZC121 is available for pipe sizes 2", 3", 4", 5", and 6".