What is the diameter of the hole underneath the grate?

Not sure of the exact diameter, but this is a snap adapter that will fit a standard 4 inch corrugated pipe.

I see 3 and 4 inch nominal pvc fitting this in the picture. Is that the sawn off end fitting onto the outlet, or the factory expanded end of the pipe?

I do not understand your questions. Part# 640 will fit 3” and 4” Drain pipe and Drain fittings. Also bell end side of the pipe, which is the equivalent of the end of a fitting.

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💧 Stay dry, stay ahead – the smart drain your lawn deserves!

DEBRIS DEFENSE SYSTEM - Keeps leaves and dirt out, preventing costly clogs and maintenance headaches.
SLEEK LOW PROFILE DESIGN - Discreet 2.5-inch adapter ensures a soil-tight, ADA-compliant, and heel-proof fit that blends into your landscape.
DURABLE LIGHTWEIGHT BUILD - Made from sturdy plastic, it’s easy to install without sacrificing long-term reliability.
EFFORTLESS WATER MANAGEMENT - Handles up to 44 gallons per minute to keep your outdoor spaces dry and pristine.
UNIVERSAL PIPE COMPATIBILITY - Seamlessly connects with both 3-inch and 4-inch drain pipes and fittings for versatile installation.

The NDS 640 6-Inch Square Grate with Low-Profile Adapter is a lightweight, durable plastic drainage solution designed for small lawns, patios, and landscaped areas. It efficiently manages moderate water flow up to 44 GPM, blocks debris to prevent clogs, and fits both 3-inch and 4-inch drain pipes. Its ADA-compliant, heel-proof design ensures a seamless, soil-tight installation that keeps your outdoor spaces clean and functional.

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HK$312

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TrustScore 4.5 | 7,300+ reviews

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The product quality is outstanding. Exactly what I needed for my work.

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Material	Plastic
Brand	NDS
Color	Black
Product Dimensions	6"W x 4"H
Item Weight	8 ounces
UPC	052063606408
Global Trade Identification Number	00052063606408
Number of Items	1
Manufacturer	NDS
Part Number	NDS - 640
Item model number	NDS - 640
Item Package Quantity	1
Number Of Pieces	1
Special Features	Lightweight
Included Components	NDS - 640
Batteries Included?	No
Batteries Required?	No

NDS 640 6-Inch Square Grate with Low-Profile Adapter Drain, Connects to 3-Inch and 4-Inch Drain Pipes and Fittings, for Small Lawns, Landscaping and Patios, Plastic, Black

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