M-D Building Products 40720 36 in. Black Vinyl DENY™ U-Shape Slide-On Under Door Seal
M-D Building Products 40720 36 in. Black Vinyl DENY™ U-Shape Slide-On Under Door Seal
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M-D Building Products

M-D Building Products 40720 36 in. Black Vinyl DENY™ U-Shape Slide-On Under Door Seal

M-D Building Products 40720 36 in. Black Vinyl DENY™ U-Shape Slide-On Under Door Seal36 in Black Vinyl DENY U Shape Slide On Under Door SealM D Building Products 40717 36 in White Vinyl DENY U Shape Slide On Under Door SealM D Building Products 40718 36 in Brown Vinyl DENY U Shape Slide On Under Door Seal
Actual Color:Black

Key item features

  • Durable Construction: Made from rigid and flexible vinyl, this under door seal provides a robust barrier between the door bottom and threshold.
  • Effective Protection: Seals against drafts, moisture, dust, and insects, with vinyl fins permanently embedded with a natural abrasive for enhanced bug deterrence.
  • Energy Savings: Helps conserve energy by sealing the bottom of the door, reducing the loss of heat or air conditioning.
  • Convenient Dimensions: Measures 36 inches in length, 2 inches in width, and 1-3/4 inches in height, and comes in a black color.
  • Easy Installation: Features a U-shape slide-on design with a compression fit that holds firmly in place, requiring no additional hardware for installation.
  • Customizable Length: Can be easily cut to the desired length using a hacksaw before installation to ensure a perfect fit.
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Current price is $23.86
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Sold and shipped by Max Warehouse
4.430011411182959 stars out of 5, based on 10516 seller reviews(4.4)
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4.1 out of 5 stars
stars14 ratings9 reviews
How item rating is calculated
  1. 5 stars64% (9)
  2. 4 stars14% (2)
  3. 3 stars7% (1)
  4. 2 stars0% (0)
  5. 1 star14% (2)

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Showing 1-3 of 9 reviews

Dec 21, 2025
Andrew
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Color: White
5 out of 5 stars review

Verified Purchase

keeps the heat in and is durable

I installed this same product several years ago and it has worn out from all the use of the door because it is my front door. so I'm getting a new one because the old one is pretty worn out. I feel like it is quite durable though and that's why I got another one of the same kind. It also does a great job keeping the heat in my home during the winter which is the main reason I got it. The plastic is pretty thick so they are a bit challenging to cut to size - I will probably use my angle grinder which is what I believe I used last time, or a multi-tool saw would work fine too.

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Helpful?2CBJY7WPGV7714688019282
Feb 1, 2026
ERIC
Item details
Color: White
5 out of 5 stars review

Verified Purchase

This is great. The install is basically instant. If it's too long for your door, you just cut it. But, be careful how you cut it so you don't have one edge end to jaggedy looking. Keeps everything from crossing, entering through what would otherwise be a hole, including dust, pet hair, and odors.

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Helpful?2CBJY7WPGV7714688019282
Dec 12, 2025
Julie
Item details
Color: White
5 out of 5 stars review

Verified Purchase

No More cold air coming under my door

Perfect solution to my cold air leaky door.

Incentivized Review
Helpful?2CBJY7WPGV7714688019282