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Figure Number: 1850
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1850Roof Drain and Overflow Drain

Designed to save installation costs and simplify installation, the roof and overflow drains of this unit are attached to a single deck plate. This permits both 8-1/2” drains to be secured to the roof deck from above the roof, eliminates the need for an underdeck clamp, and requires only one roof penetration. The roof drain has a combined flashing clamp and gravel stop. The overflow drain is fitted with a combined flashing clamp and 2” water dam. The pair are constructed of Duco coated cast iron and protected by polyethylene dome strainers.

WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov - Learn More about this warning
Shows specifications for standard configuration. Configuration options may change specifications.
  • Variations
    Vandal Proof - Dome - U, Underdeck Clamp for 10" Deck Opening -C10, Extension -E - (Specify Height), LXH Speedi-Set® Extra Heavy, Secondary Flashing Clamp -C2, Expansion Joint (Specify Fig.1710), (2) 3/8” (10) Tappings -TAP, 4” (102) Tall S.S. Perforated Gravel Guard -GG04
  • Product Type
    Roof Drain
  • Optional Materials
    Rough Bronze Dome -RBD, Stainless Steel Mesh Over Dome -SSM, Aluminum Dome -AD, Cast Iron Dome -CID, Galvanized Cast Iron Dome -CIDG, Galvanized Cast Iron -G - Body & Collar
SubmittalSubmittal 1850 Roof Drain (pdf)
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Technical Drawings
1850 Roof Drain (dwg)Roof Drain and Overflow [1850C | Caulk Bottom Outlet; 1850T | Threaded Bottom Outlet; 1850Y | No-Hub Bottom Outlet] DWG176 KB
1851 Roof Drain (dwg)Special Purpose Combination Roof Drain and Overflow, Featuring 2" High External Water Dam for Overflow [1851C | Caulk Bottom Outlet; 1851T | Threaded Bottom Outlet;1851Y | No-Hub Bottom Outlet]DWG124 KB
1850 Drain Round Type (rfa)Roof Drain and Overflow [1850C | Caulk Bottom Outlet; 1850T | Threaded Bottom Outlet; 1850Y | No-Hub Bottom Outlet]RFA2 MB
Literature / Videos
Submittal 1851 Roof Drain (pdf)Special Purpose Combination Roof Drain and Overflow, Featuring 2" High External Water Dam for Overflow [1851C | Caulk Bottom Outlet; 1851T | Threaded Bottom Outlet;1851Y | No-Hub Bottom Outlet]PDF2 MB
MGI Corporate Brochure (pdf)Who we are, Our History, Morris Group International TodayPDF8 MB
MGI Brands Flyer (pdf)MGI Brands Flyer (pdf)PDF712 KB
Technical Data for Roof DrainsTechnical Data for Roof DrainsPDF2 MB
Order Guidelines for Roof DrainsOrder Guidelines for Roof DrainsPDF120 KB
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Roof Drain and Overflow [submittal]
1850C | Caulk Bottom Outlet
1850T | Threaded Bottom Outlet
1850Y | No-Hub Bottom Outlet

Special Purpose Combination Roof Drain and Overflow, Featuring 2" High External Water Dam for Overflow [submittal]
1851C | Caulk Bottom Outlet
1851T | Threaded Bottom Outlet
1851Y | No-Hub Bottom Outlet