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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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

Product ID: 20840488

Details

Brand
NDS
Color
Black
Item Weight
8 ounces
Material
Plastic
Product Dimensions
6.19"W x 2.5"H

💧44 GPM flow rate

🔗Fits 3" & 4" pipes

🛡️Blocks leaves & debris

$75.20

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Sold byAmazon EcuadorDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

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

DEBRIS DEFENSE SYSTEM - Keeps leaves and dirt out, preventing costly clogs and maintenance headaches.
ADA COMPLIANT HEEL PROOF - Designed for safety and durability, perfect for patios and walkways where style meets function.
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.
LOW PROFILE HIGH PERFORMANCE - Sleek 2.5-inch adapter ensures a soil-tight fit without disrupting your landscape’s aesthetic.

The NDS 640 6-Inch Square Grate with Low-Profile Adapter is a durable, plastic drainage solution designed for small lawns, patios, and landscaped areas. It supports moderate water flow up to 44 GPM, blocks debris to prevent clogs, and fits both 3-inch and 4-inch drain pipes. ADA compliant and heel-proof, it offers a sleek, soil-tight fit that blends seamlessly into your outdoor space while protecting your drainage system.

Specifications

ASIN	B006H3RXCC
Best Sellers Rank	#19,623 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #441 in Pipe Fittings
Brand Name	NDS
Color	Black
Customer Reviews	4.6 4.6 out of 5 stars (398)
Global Trade Identification Number	00052063606408
Included Components	NDS - 640
Item Dimensions W x H	6.19"W x 2.5"H
Item Type Name	NDS - 640
Item Weight	8 ounces
Manufacturer	NDS
Manufacturer Part Number	NDS - 640
Material Type	Plastic
Model Number	NDS - 640
Number of Items	1
Number of Packs	1
UPC	052063606408
Unit Count	1 Count

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$75.20

Duties & taxes included

In stock

Sold byAmazon EcuadorDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Ecuador.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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1 week ago

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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