To get a good seal, when cutting my 18 corrugated pipe: Do I need to cut @ the outside or inside of corrugation? or does it not matter?

Not exactly sure what is meant by the inside or outside of the corrugation, but you want to cut the pipe as straight as possible to have the best seal with the lid.

Are these flat Like other sizes also?

I believe you could call it flat. Around the rim are holes for hold down screws. I used a few but I don't think they are necessary. My cover is 6" down and I have driven my tractor over the top soil many times,so it is durable.

Will this fit a norwesco 24 in by 20 in manhole extension?

This cover is designed to fit corrugated pipe with an inside diameter of 18". I would recommend looking at the technical drawing for this product on the manufacturers website to determine if it would fit your application: https://www.polylok.com/mwdownloads/download/link/id/320/ Seeing that this covers OD is only 20.57" I would say no to your question.

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Polylok 18" Heavy Duty Cover/Lid for Corrugated Pipe (PN: 3007-HDC)

Polylok 18" Heavy Duty Cover/Lid for Corrugated Pipe (PN: 3007-HDC)

Product ID: 93591982

Details

Brand
Polylok
Color
Green
Material
High Density
Product Dimensions
21"L x 21"W
Style
Compact

📏Fits 18" corrugated pipe precisely

🔒Square drive screws for security

🛡️Highest UV protection for durability

₨5067

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Description

🛠️ Lock in durability and security with Polylok’s heavy-duty cover!

ULTIMATE UV SHIELD - Crafted with the highest level of UV protection to maintain strength and color under harsh sun exposure.
ENHANCED SECURITY SCREWS - Equipped with square drive screws designed to deter unauthorized access and enhance safety.
RUGGED HDPE CONSTRUCTION - Made from durable High Density Polyethylene for long-lasting, heavy-duty use in demanding conditions.
AIRTIGHT WATERTIGHT SEAL - Includes a factory-installed foam gasket that guarantees leak-proof performance in any environment.
PRECISION FIT FOR 18 PIPES - Engineered to snugly fit 18" corrugated or ribbed pipes, ensuring seamless integration.

The Polylok 18" Heavy Duty Cover/Lid (PN: 3007-HDC) is a robust, precision-engineered HDPE cover designed to fit 18" corrugated pipes. Featuring the highest UV protection, a foam gasket for airtight and watertight sealing, and security-enhancing square drive screws, it offers unmatched durability and safety for professional drainage and plumbing applications.

Specifications

ASIN	B00JEL9XEK
Best Sellers Rank	#49,850 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1,395 in Pipe Fittings
Brand Name	Polylok
Color	Green
Customer Reviews	4.5 4.5 out of 5 stars (200)
Item Dimensions L x W	21"L x 21"W
Item Weight	1.8 pounds
Manufacturer	Polylok
Manufacturer Part Number	3007-HDC
Material Type	High Density Polyethylene
Model Number	3007-HDC
Number of Pieces	1
Product Style	Compact
Shape	Round
UPC	762022552119
Unit Count	1 Count

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₨5067

Duties & taxes included

In stock

Sold byAmazon SeychellesDelivered 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 Seychelles.

Secure transaction

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