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Swift Seal Foundation Vent Inserts are thick foam blocks that push into foundation vents from outside to block drafts, moisture, insects and rodents. The 10-pack is sized 6.5" x 8.75" with 1 1/4" foam, reversible gray/brown faces, a trimming knife and a removal tool. They are a reusable alternative to brittle Styrofoam inserts that crack each season. The best new price is $44.95 at Walmart as of November 4, 2026, with 3 stores listing it new.
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Lowest price we've seen: $44.95 on Nov 4 at Walmart. Tracked across 2 stores since Nov 4.
SwiftSeal Foundation Vent Covers – Airtight Foundation Vent Blocks (10 Pack)
Seal it once. Protect for years.
Tired of replacing cheap Styrofoam vent inserts every season?
SwiftSeal Vent Covers are a durable, long-term solution designed to block drafts, moisture, and pests—without crumbling, cracking, or falling apart🏡 Why homeowners choose SwiftSeal:
✔ Airtight seal – Blocks cold air, moisture, insects, and rodents
✔ Reversible design – Gray on one side, dark brown on the other to match your home
✔ Built to last 10+ years – No more replacing brittle foam inserts
✔ Energy-saving insulation – Helps reduce drafts and heating costs
✔ Freeze protection – Helps protect pipes in cold weather
✔ Low-profile recessed insert design, slides in effortlessly—no tools required
✔ Year-round performance – Keeps cold out in winter, heat out in summer
✔ Fast DIY install – Push in from the outside in seconds
✔ Custom fit with knife included– Trim easily around pipes, cables, or irregular openings
✔ Simple removable design - Just pull out when you want to remove
✔ Durable foam construction – Won’t crumble, break, or degrade
✔ Made in USA – Nontoxic materials, built to last
📦 What’s included:
• Pack of 10 vent covers
• Extra thick 1 1/4” foam for superior insulation
• Comes in reversible Gray or Dark Brown
• Knife included for notching around cables/pipes
• Comes with a Swift convenient removal tool
• Multiple sizes available
• Custom sizes available (message us anytime)
