- Heavy-Duty Cast Iron Construction: Forged from premium-grade cast iron to deliver structural strength, ensuring maximum resistance against physical impacts, heavy roof loads, and harsh industrial environments.
- Protective Green Duco Finish: Coated in a signature green rust-inhibiting finish that provides critical corrosion defense against standing water, weathering, and industrial shop grime.
- High-Capacity Large Sump Profile: Built with a 13-inch outside diameter and a 4½-inch height, providing an open, slotted geometry that maximizes water flow while effectively screening out oversized jobsite debris.
- Exact Josam 21500-Series Alignment: Engineered to serve as a precise, direct-fit replacement component designed to seat flush and center seamlessly onto Josam 21500-series large sump commercial roof drains.
Price: $159.95
Item #316-029279F
Write a review!
Description
The Josam 21504-22 Cast Iron Dome is constructed from cast iron in a green finish and is designed for use with the Josam 21500-series large sump roof drains. It has an outside diameter of 13 inches and a height of 4½ inches. The design covers the drain opening and allows water to flow while helping to prevent large debris from entering.
Key Features
-
Material: cast iron
-
Outside diameter: 13 inches
-
Height: 4½ inches
-
Color: green
-
Designed to fit Josam 21500-series large sump roof drains
Specifications
Manufacturer: Josam Company
Model/SKU: 21504-22
Material: Cast iron
Outside diameter: 13 inches
Height: 4½ inches
Color: Green
Quantity: Kits sold individually
Gate: Not included (sold separately)
How To
- Remove the existing dome or grate from the Josam 21500-series roof drain body.
-
Clean the drain lip and ensure the surface is clear and level.
-
Place the new 21504-22 Cast Iron Dome onto the drain opening so it sits flush and stable.
-
Secure the dome per manufacturer instructions for the drain body.
-
Run water to verify unobstructed drainage and proper alignment.
FAQs
Q: Is the 21504-22 Cast Iron Dome compatible with all Josam dome options?
A: The 21504-22 is intended specifically for the Josam 21500-series large sump roof drains; other series may require different dome styles.
Q: Why choose a cast iron dome rather than a polypropylene one?
A: A cast iron dome offers increased durability and strength in heavy-use or industrial roof environments compared to lighter materials.
Q: Does the 21504-22 dome include the clamp ring or mounting hardware?
A: The dome is supplied as the cover component only; any clamp ring or mounting hardware must be purchased separately.
Reviews (0) • Write a review!
This product has no reviews yet. Write a review!
Josam 22010 - Cast Iron Dome
Outside diameter 10-1/4"
Price: $129.95
Availability: In Stock
Usually ships within 1-2 Business Days
The Josam 22010 Cast Iron Dome is built from green-coated cast iron in a beehive style and pairs with the Josam 22010 series medium sump roof drains. It has an outside diameter of 10½ inches and a height of 5¼ inches. The dome is designed to cover the drain opening while allowing water to flow through and intercept debris. Key Features Material: cast iron Outside diameter: 10½ inches Height: 5¼ inches Color: green Beehive style dome for medium sump roof drains ...
Josam 21504 - Poly Dome
Outside diameter 13"
Price: $79.55
Availability: In Stock
Usually ships within 1-2 Business Days
The Josam 21504 Poly Dome is manufactured from durable black polypropylene and fits the Josam 21500-series roof drains. It features a 13-inch outside diameter and a height of 4½ inches. This component helps prevent debris entry while maintaining full drainage capacity. Key Features Material: polypropylene Outside diameter: 13 inches Height: 4½ inches Color: black Designed to fit Josam 21500-series large sump roof drains ...
Josam 4116 - Old Style Cast Iron Dome
Outside diameter 14-1/16"
Price: $759.95
Availability: In Stock
Usually ships within 1-2 Business Days
The Josam 4116 Old Style Cast Iron Dome is a cast iron, green-coated replacement dome for compatible Josam roof drains. The design provides a large free area to maintain flow while screening debris. Dimensions and performance values are taken directly from Josam’s official submittal for part 029350. Key Features Cast iron construction with green coating Old style dome design with 32 ribs and 32 slots Large free area rated at approximately 116 square inches Outside diameter approximately...
Josam 21504 - Cast Iron Ring
Outside diameter 13-3/4"
Price: $192.00
Availability: In Stock
Usually ships within 1-2 Business Days
The Josam 21504 Cast Iron Clamp Ring is made from durable cast iron with a protective green coating and is designed for use with Josam 21500-series roof drains. It features an outside diameter of 13-3/4 inches with bolt-to-bolt diameters of 10-3/4 inches (180°) and 7-1/2 inches. This ring securely fastens the roofing membrane or flashing to the drain body, ensuring a watertight seal. Key Features Material: cast iron Color: green Outside diameter: 13-3/4 inches 180° bolt-to-bolt diameter:...