The Rain Bird DG12SFB 12" Square Flat Drainage Grate (Black) is a professional-grade drainage cover engineered for residential and commercial landscape applications where reliable surface water management matters. Manufactured from structurally foamed High-Density Polyethylene (HDPE) with a built-in UV inhibitor, this grate is built to withstand years of sun exposure and heavy use without cracking, warping, or degrading. Whether you're installing a new catch basin system, replacing a worn grate, or completing a yard drainage overhaul, the DG12SFB delivers the flow capacity, structural strength, and compliance features that professionals and homeowners demand.
Designed to fit 12" square catch basins and 12" square low-profile basins, this flat grate features wide open slots sized at 7/16" — large enough to allow a maximum flow rate of 70 GPM through 53 square inches of open surface area, while still blocking leaves, mulch, and other large debris from entering the drainage system and causing clogs. The textured anti-skid surface makes it safe underfoot in walkways, driveways, and high-traffic areas, and the grate is ADA compliant — an important requirement for commercial properties, public spaces, and any accessible pathway. With a maximum load rating of 3,000 lbs., it's rated for use in areas with vehicle access at speeds under 20 mph, including light-truck traffic. Two built-in screw holes allow the grate to be secured to the basin with #6 × 1-1/2" Phillips flat-head stainless screws (not included) for added security against vandalism or displacement.
DripWorks carries the complete Rain Bird drainage product line, including catch basins, adapters, and grates in multiple sizes and styles. Need a different grate style for areas with heavier floating debris? Compare this flat grate to the Rain Bird DG12SAB 12" Square Atrium Grate, also available in our Drainage category. For complete yard water management solutions, pair this grate with our rain catchment and greywater products.
| Specification | Details |
|---|---|
| SKU (DripWorks) | RBDG12SFB |
| Model (Rain Bird) | DG12SFB |
| Grate Shape | Square |
| Grate Type | Flat |
| Size | 12" |
| Color | Black |
| Material | Structurally Foamed High-Density Polyethylene (HDPE) with UV Inhibitor |
| Maximum Flow Rating | 70 GPM |
| Open Surface Area | 53 sq in |
| Open Slot Width | 7/16" |
| Maximum Load Rating | 3,000 lbs (autos and light trucks at speeds under 20 mph) |
| Compatible Basins | 12" Square Catch Basins; 12" Square Low-Profile Basins |
| Pipe Compatibility | Sewer & Drain Pipe, Fittings, Triple Wall Pipe, Corrugated Pipe |
| Surface Texture | Textured Anti-Skid |
| Mounting | Two screw holes; use #6 × 1-1/2" Phillips flat-head stainless screws (not included) |
| ADA Compliant | Yes |
| Country of Origin | Made in the USA |
| Brand | Rain Bird |
What basins is the DG12SFB compatible with?
This grate is designed to fit Rain Bird's 12" Square Catch Basins and 12" Square Low-Profile Basins. It is also engineered to attach directly to Sewer and Drain pipe, Fittings, Triple Wall Pipe, and Corrugated Pipe. Always verify your basin size before ordering.
What is the difference between a flat grate and an atrium grate?
A flat grate (like this DG12SFB) sits flush with or just above grade and is ideal for most standard catch basin applications in yards, driveways, and landscape beds. An atrium grate (such as the Rain Bird DG12SAB) features a raised dome or basket design that keeps the grate opening above accumulated debris, making it better suited for areas with heavy leaf fall, mulch, or floating organic matter that could block a flat grate. Both styles are available in our Drainage category.
Is this grate safe to drive over?
Yes. The DG12SFB is load-rated for 3,000 lbs, which covers passenger vehicles and light trucks traveling at speeds under 20 mph. It is not rated for heavy commercial truck traffic. For high-traffic driveways, verify that both the grate and the catch basin below are rated for your expected loads.
Is the DG12SFB ADA compliant?
Yes. The grate's slot width of 7/16" and flat profile meet ADA requirements for surface openings in accessible routes. This makes it appropriate for use in walkways, patios, parking areas, and other spaces subject to accessibility standards.
Does the UV inhibitor actually prevent sun damage?
Yes. The HDPE material in this grate includes a UV stabilizer compounded into the plastic during manufacturing — this is not a surface coating. It significantly slows the degradation and color fading that untreated black plastic experiences with prolonged sun exposure, making it a better long-term choice than standard polyethylene grates for installations in full sun.
How do I secure the grate to the basin?
The DG12SFB includes two screw holes for optional fastening. Rain Bird recommends using #6 × 1-1/2" Phillips flat-head stainless steel screws (not included). Securing the grate prevents it from being displaced by heavy water flow, foot traffic, or vandalism.
What is the maximum flow this grate can handle?
The DG12SFB is rated for a maximum flow of 70 GPM through its 53 sq in of open surface area. For most residential yard drainage applications — including managing runoff from downspouts, paved areas, or irrigated turf — this capacity is more than sufficient. If your application involves larger volumes or combined inflow from multiple sources, evaluate whether a larger or multiple catch basin system is appropriate.
Can I use this grate in a driveway or parking area?
Yes, provided vehicle speeds remain under 20 mph and the load does not exceed the 3,000 lb rating. For heavier-duty vehicle areas, consult a licensed drainage engineer to confirm appropriate product specifications.
Before you install, verify the following:
Pair this grate with the right supporting products for a complete, functional surface drainage solution:
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