The Thunderbird Products Bottom Outlet Roof Drain is a professional-grade flat roof drainage outlet designed for reliable water removal on commercial and residential flat roof systems. This heavy-duty roof outlet provides efficient drainage through its bottom outlet configuration, making it an ideal flat roof drainage outlet replacement for aging or underperforming roof drains.
Features
- Heavy-Duty 20-Ounce Copper Construction: Built with thick 20-ounce copper for superior durability and corrosion resistance. Copper outperforms plastic alternatives by resisting rust, melting, and cracking, ensuring decades of reliable performance in flat roof drainage applications.
- Seamless Flashing & Drain Basin: The seamless design eliminates weak points and prevents leaks, ensuring efficient water flow from your flat roof drainage outlet to your drainage system. Sandblasted flashing provides superior adhesion for waterproofing membranes.
- Bottom Outlet Design: The bottom outlet configuration offers maximum flexibility for connecting drainage pipes at the base of the unit, simplifying installation and roof drain outlet pipe connections.
- Multiple Size Options: Available in 2", 3", 4", and 6" drain sizes to accommodate various flat roof drainage requirements and pipe specifications.
- Strong ABS Cyclolac Dome Strainer: The included strainer effectively blocks leaves, debris, and pests from entering your drainage system, preventing clogs and maintaining optimal water flow through the roof outlet.
- Made in the USA: Thunderbird roof drains are proudly manufactured in the United States, ensuring quality craftsmanship and reliable performance.
Applications
- Flat Roof Drainage Systems: Specifically engineered for flat roof drainage outlet installations where efficient water removal is critical. This bottom outlet roof drain effectively channels rainwater and prevents ponding on flat roofing surfaces.
- Roof Drain Replacement Projects: An excellent flat roof drainage outlet replacement option for aging drains, offering superior materials and construction.
- Versatile Installation Options: The flat roof drainage outlet kit includes your choice of threaded adapter fittings or standard no-hub fittings for seamless connection to PVC, cast iron, or other drainage pipes.
- Commercial & Residential Applications: Suitable for commercial buildings, warehouses, apartment complexes, and residential properties with flat or low-slope roofing systems.
The Thunderbird Products Bottom Outlet Roof Drain delivers long-lasting performance as a reliable flat roof drainage outlet for your roofing system. With professional-grade copper construction and flexible installation options, this roof outlet ensures efficient water removal and protection against water damage for years to come.
This item is also available with optional overflow; as well as in Stainless Steel, TPO Clad, and PVC Clad.
Note on Fittings: Two types of fittings are available. A threaded adapter fitting is used primarily with 2" PVC pipe applications. The threads on the bronze fittings are male and can be attached to a threaded female PVC adapter. A no-hub fitting is the standard fitting used in the industry. With this fitting, a rubber coupling is used to connect the drain to the drainage pipe.
| Product Drawings | Copper Bottom Outlet Roof Drain PDF Drawing Copper Bottom Outlet Roof Drain CAD Drawing |
|---|---|
| Compliance | ![]() |
| RD2NH | 2" No-Hub Copper Bottom Outlet Roof Drain |
| RD2NHCR | 2" No-Hub Copper Bottom Outlet Roof Drain w/ Optional Clamping Ring |
| RD2TA | 2" Male Threaded Copper Bottom Outlet Roof Drain |
| RD2TACR | 2" Male Threaded Copper Bottom Outlet Roof Drain w/ Optional Clamping Ring |
| RD3NH | 3" No-Hub Copper Bottom Outlet Roof Drain w/ Optional Clamping Ring |
| RD3NHCR | 3" Male Threaded Copper Bottom Outlet Roof Drain w/ Optional Clamping Ring |
| RD3TA | 3" Male Threaded Copper Bottom Outlet Roof Drain |
| RD4NH | 4" No-Hub Copper Bottom Outlet Roof Drain w/ Optional Clamping Ring |
| RD4NHCR | 4" Male Threaded Copper Bottom Outlet Roof Drain w/ Optional Clamping Ring |
| RD6NH | 6" No-Hub Copper Bottom Outlet Roof Drain w/ Optional Clamping Ring |
Bottom Outlet Roof Drain
Excellent product
I installed it on my commercial property with flat roof.
It was easy to install and it has copper flashing so I don't have to worry about rusting anymore
Happy with the product. first purchase with this company; service was excellent.
great






