Zurn Z121-EB Roof Drain—Top Set Adjustable Extension Assembly
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 - 4, 6 | 31 | 78 |
ENGINEERING SPECS: Zurn Z121-EB 12-in. roof drain includes a dura-coated cast iron (DCCI) body with combination membrane flashing clamp / gravel guard, Top-Set® adjustable extension assembly, and low-silhouette poly dome.
Outlet Types
| Outlet Type | Available Pipe Sizes (in.) |
Body Height Dimension (in.) (E) |
| 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 | 4-5/8 |
Dome Options
| Poly Dome* (4-1/4 in. height) with DCCI Body (Z) |
| Aluminum Dome (6-9/16 in. height) with DCCI Body (ZA) |
| Low Silhouette Cast Iron Dome (4-1/4 in. height) with DCCI Body (ZC) |
| Plain Bronze Dome (3-7/8 in. height) with DCCI Body (ZRB) |
*Regularly furnished unless otherwise specified
Available Accessories
| Acid Resistant Epoxy Coated Finish (-AR) | Neo-Loc Test Cap Gasket (2 - 4 in. NL Bottom Outlet Only) (-TC) |
| Bronze Mesh Screen Over Dome (-BS) | Vandal-Proof Secured Top (-VP) |
| Deep Sump Body (-DB) | Vertical Expansion Joint (-XJ) |
| Static Extension (1 - 4-in.; specify height) (-E) | Stainless Steel Perforated Gravel Guard (-84) |
| Flush Grate (Replaces dome strainer) (-FG) | Stainless Steel Perforated Extension (-85) |
| Galvanized Cast Iron (-G) | 2-in. High External Water Dam (-89) |
| Secondary Clamping Collar (-SC) | 90° Threaded Side Outlet Body (2 - 4-in. only) (-90) |
| Stainless Steel Mesh Screen Over Dome (-SS) |
