What size/width slot is required for pushing the plastic edge into?

Not sure what width you are asking about. If you are talking about the channel it goes into it is pretty much standard size which is a groove you press the flange into. The only width/gap you need to make sure of is the door to the frame which is about 5/8. Close your door and measure the spacing. I used this to replace the original of 37 years old and it fit like a charm. Very satisfied, looks good and will stop any air leaks. Hope this helps.

The groove you press the flange into should be installed first, because regular doors do not have it, right?

Actually our door had a groove and we just replaced the old stripping that the cats had shredded. Easy and worked great

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40 Feet Rubber Weather Stripping Door Seal Strip, Self-Adhesive Backing D-Shape Door Weatherstripping for Door Frame Insulation Large Gap, Easy Cut to Size(White)

40 Feet Rubber Weather Stripping Door Seal Strip, Self-Adhesive Backing D-Shape Door Weatherstripping for Door Frame Insulation Large Gap, Easy Cut to Size(White)

Product ID: 557089077

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Details

Brand
Fingwerk
Material
Rubber
Color
White D-Shaped
Product Dimensions
480"L x 0.35"W
Item Thickness
0.23 Inches

📏40 feet length for full coverage

❄️Flexible rubber resists extreme temps

🛠️Self-adhesive backing for easy install

Description

🚪 Seal smart, live cozy — don’t let the chill in!

STICK STAY POWER - Super strong 3M adhesive ensures a firm hold even in harsh weather
CUT TO FIT NO FUSS - Easily trim with scissors for a custom fit on any door or window frame
WEATHERPROOF YOUR SPACE - Flexible rubber won’t crack or freeze, keeping cold, dust, and noise out
SEAL EVERY GAP LIKE A PRO - 40 feet of D-shaped rubber fits gaps from 2.5 to 5.5 mm perfectly
VERSATILE INSULATION SOLUTION - Ideal for doors, windows, cabinets, speakers, and more—upgrade your entire space

This 40-foot white D-shaped rubber weather stripping from Fingwerk features a 0.23-inch thickness and 0.35-inch width, designed to seal gaps between 2.5 and 5.5 mm. With a strong self-adhesive backing, it installs easily and stays firmly in place, resisting cracking or freezing in extreme temperatures. Perfect for insulating doors, windows, and more, it reduces drafts, dust, noise, and wear, enhancing home comfort and energy efficiency.

Specifications

Brand	Fingwerk
Material	Rubber
Color	White D-Shaped
Product Dimensions	480"L x 0.35"W
Item Thickness	0.23 Inches
Recommended Uses For Product	door and window frame insulation, preventing wind, dust, sound, and cold
Number of Items	1
Manufacturer	Fingwerk
Unit Count	40.0 Feet
Part Number	‎FD40W
Item Weight	12.3 ounces
Item model number	‎FD40W
Size	40Ft
Included Components	Bag

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40 Feet Rubber Weather Stripping Door Seal Strip, Self-Adhesive Backing D-Shape Door Weatherstripping for Door Frame Insulation Large Gap, Easy Cut to Size(White)

Details

Description

Specifications

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