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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🚪 Seal in comfort, seal out chaos!

ALL WEATHER DURABILITY - Rubber material stays flexible, won’t crack or freeze in cold or heat
CUSTOM FIT FOR ANY FRAME - Easily cut to size and shape for a seamless, professional finish
MULTI PURPOSE PROTECTION - Blocks wind, dust, noise, and reduces wear on doors and windows
EFFORTLESS DIY INSTALLATION - Peel-and-stick adhesive ensures a firm hold without tools or hassle
SEAL EVERY GAP WITH PRECISION - 40 feet of D-shaped rubber fits gaps from 2.5 to 5.5 mm perfectly

Fingwerk’s 40 ft self-adhesive D-shaped rubber weather stripping offers a versatile, durable solution to seal door and window gaps from 2.5 to 5.5 mm. Its flexible, weather-resistant material ensures long-lasting protection against drafts, dust, noise, and temperature extremes, while the easy peel-and-stick installation and customizable length make it perfect for any home improvement project.

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₨17219

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Manufacturer	Fingwerk
Item Weight	381 g
Product Dimensions	1219.2 x 0.89 x 0.1 cm; 381 g
Size	40Ft
Color	Black D-Shaped
Material	Rubber
Item thickness	0.23 Inches
Item Package Quantity	1

Fingwerk 40 Ft Weather Stripping Door Seal Strip, Self-Adhesive Backing D-Shape Rubber Weather Stripping for Door Frame Large Gap, Easy Cut to Size(Black)

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