NDS 642 6 in. Square Grate with Low-Profile Adapter, Gray

The NDS 642 is a 6 in. square drain grate paired with a low-profile adapter designed to capture surface water while preventing debris from entering the drainage system. Manufactured for reliable residential and light-commercial performance, the unit provides a balance of flow capacity and clog resistance for patios, walkways, landscaped beds, and downspout discharge areas.

• Compatibility: fits 3" and 4" sewer & drain pipes and fittings, 3" and 4" single-wall corrugated pipe, and 3" and 4" triple-wall pipe for flexible installation options.
• Materials & durability: grate is molded from high-density polyethylene (HDPE); adapter is high-impact polystyrene (HIPS) treated with UV inhibitors. Stainless steel fasteners secure the grate in place.
• Performance: flared design yields 14.4 sq. in. of open surface area and a 44 GPM flow rate, providing more capacity than a grate that matches the pipe diameter.
• Dimensions: grate top measures approximately 5-7/8 in. square with 1/4 in. openings; adapter height is 2.5 in.; top opening is about 6-3/16 in. square—removable grate simplifies inspection and cleaning.
• Benefits: lightweight, rustproof, chemical-resistant, and maintenance-friendly; ideal where pedestrian traffic or downspout runoff must be managed without heavy-duty vehicular loading.

Installation is straightforward: set the adapter onto compatible pipe or fittings, secure the grate with the supplied stainless fasteners, and verify flow path before backfilling. For engineering specifications, flow capacities, CAD drawings, and detailed installation diagrams refer to NDS technical literature and the product tech sheet available from the manufacturer.