Zurn Z121-BS Roof Drain — Bronze Mesh Screen
Dimensional data is subject to manufacturing tolerances and change without notice.
Download Specifications PDF
| Pipe Size (in.) |
Approx. Weight (lbs.) |
Dome Open Area (sq. in.) |
| 2 - 6 | 22 | 78 |
ENGINEERING SPECS: Zurn Z121-BS 12-in. roof drain includes a dura-coated cast iron (DCCI) body with combination membrane flashing clamp / gravel guard, and a low-silhouette cast iron dome with bronze mesh screen.
Outlet Types
| Outlet Type | Available Pipe Sizes (in.) |
E. Body Height Dimension (in.) |
| Inside Caulk (IC) | 2 - 4, 6 | 5-1/4 |
| Threaded (IP) | 2 - 4, 6 | 3-3/4 |
| No-Hub (NH) | 2 - 4, 6 | 5-1/4 |
| Neo-Loc (NL) | 2 - 4 | 4-9/16 |
Dome Options
| Dome* (4-1/4 in. height) with DCCI Body (Z) |
| Aluminum Dome (6-9/16 in. height) with DCCI Body (ZA) |
| Plain Bronze Dome (3-7/8 in. height) with DCCI Body (ZRB) |
*Regularly furnished unless otherwise specified
Available Accessories
| Acid Resistant Epoxy Coated (-AR) | Roof Sump Receiver (-R) |
| Underdeck Clamp (-C) | Secondary Clamp Collar (-SC) |
| Top-Set® Roof Deck Plate (Replaces both the Underdeck Clamp and Roof Sump Receiver) (-DP) | Vandal-Proof Secured Top (-VP) |
| Adjustable Drain Riser Extension Assembly (from 3-5/8 to 7-1/4) (-DR) | Vertical Expansion Joint (-XJ) |
| Static Extension (1 - 4-in.; specify height) (-E) | Stainless Steel Perforated Extension (-85) |
| Top-Set® Adjustable Extension Assembly (-EB) | 2-in. High External Water Dam (-89) |
| Flush Grate (Replaces dome strainer) (-FG) | 90° Threaded Side Outlet Body (2 - 4-in.) (-90) |
| Galvanized Cast Iron (-G) |
