how many feet come in a 3 pk?

Both INDIVIDUAL packs - the 3/8" and the 1/2"- are 20 feet long.

no 1/4" one? either 20 or 50ft?

Not in this brand, but Amazon offers 1/4-inch backer rod in various lengths, from 10 feet to 100 feet, from other brands. Just search on "Backer Rod 1/4 Inch".

can the backer rod be sliced for smaller openings?

I have not done that, but it cuts easily with a sharp knife or scissors, so you should be able to slice it to fit whatever opening you have. It's good stuff!

Can his be used for exterior windows before caulking?

I used it to push into larger cracks in my driveway before applying concrete filler, and it worked great. I'm thinking that it should work well for filling in spaces around your windows prior to caulking.

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M-D Building Products 71464 Backer Rod For Gaps and Joints, 3/8-by-20 Feet, Gray

M-D Building Products 71464 Backer Rod For Gaps and Joints, 3/8-by-20 Feet, Gray

Product ID: 146700517

Details

Brand
M-D Building
Colour
Gray
Item form
Foam
Item weight
0.6 Ounces
Surface recommendation
Door Window

✂️Easily trimmed to fit any joint size

🌦️Weather-resistant for indoor/outdoor durability

🛠️3/8-inch diameter for precise gap filling

€ 41.16

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Sold byAmazon CyprusDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛡️ Seal the gap, seal your comfort—don’t let drafts crash your vibe!

MULTI USE MASTERY - Ideal for sealing doors, windows, driveways, and expansion joints, enhancing insulation and draft protection.
CUT TO SIZE CONVENIENCE - Trim with scissors to customize length and diameter—perfect for any project.
EFFORTLESS INSTALLATION - Simply push into gaps—no adhesives or messy sealants required, saving you time and hassle.
PRECISION FIT EVERY TIME - 3/8-inch diameter ensures a snug, professional seal for medium gaps.
BUILT TO BRAVE THE ELEMENTS - Crafted from weather-resistant rubber, silicone, and vinyl for lasting outdoor and indoor performance.

The M-D Building Products 71464 Backer Rod is a 3/8-inch diameter, 20-foot gray foam rod designed to fill medium gaps and joints. Made from durable, weather-resistant rubber, silicone, and vinyl, it provides a reliable base for caulking and insulation in both indoor and outdoor settings. Easy to install and trim, it prevents drafts, dust, and moisture infiltration, enhancing energy efficiency and comfort across a variety of applications.

Specifications

ASIN	B000BQS90G
Best Sellers Rank	449,619 in Garden ( See Top 100 in Garden ) 2,520 in Watering Cans 6,952 in Sealers 55,454 in Fishing (Sports & Outdoors)
Brand	M-D Building Products
Colour	Gray
Customer Reviews	4.6 4.6 out of 5 stars (1,564)
Global Trade Identification Number	00043374714647
Included Components	MD Building - 71464 - 2pk
Item Form	Foam
Item Type Name	MD Building - 71464 - 2pk
Item Weight	0.6 Ounces
Manufacturer	M-D Building Products
Manufacturer Part Number	71464
Material	Rubber, Silicone, Vinyl
Model Number	71464
Number of Items	1
Number of Packs	1
Surface Recommendation	Door, Window
UPC	043374714647
Unit Count	1.0 count

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

Rajesh P.

Customer service was outstanding when I had questions about the product.

2 days ago

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€ 41.16

Duties & taxes included

In stock

Sold byAmazon CyprusDelivered 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 Cyprus.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

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