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The only airtight enclosure system for electrical junction boxes:

patent-pending, inexpensive, and ready to ship.

FREE SHIPPING on all orders over $150.00

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Choose Your BOX SHELL
Single BOX SHELL
Single BOX SHELL
Insulates a single outlet box or switch box. Works well for data connections as well.
$2.39
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Single BOX SHELL 25-Pack
CONTRACTOR PACK
Single BOX SHELL — 25 Pack
25 Single BOX SHELLs. Bulk contractor pricing — save time and money on new construction and remodel projects.
$49.99
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Single BOX SHELL 50-Pack
CONTRACTOR PACK
Single BOX SHELL — 50 Pack
50 Single BOX SHELLs. Best value for large projects — IECC 2024 compliant, no caulk required.
$99.99
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Double BOX SHELL
Double BOX SHELL
Insulates a double outlet box OR ROUND BOXES!!! The only device that seals around the wires, all the way around the box and fills the void behind the box.
$2.49
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Double BOX SHELL 25-Pack
CONTRACTOR PACK
Double BOX SHELL — 25 Pack
25 Double BOX SHELLs. Seals double outlet boxes and round boxes. Bulk contractor pricing.
$59.99
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Double BOX SHELL 50-Pack
CONTRACTOR PACK
Double BOX SHELL — 50 Pack
50 Double BOX SHELLs. Best value for large projects — IECC 2024 compliant, no caulk required.
$119.99
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Triple BOX SHELL
Triple BOX SHELL
Insulates a triple outlet/switch box. This is a great product to have as an extra bit of material to make a custom surround for a unique circumstance.
$2.79
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Triple BOX SHELL 25-Pack
CONTRACTOR PACK
Triple BOX SHELL — 25 Pack
25 Triple BOX SHELLs. Seals triple outlet and switch boxes. Bulk contractor pricing.
$68.99
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Triple BOX SHELL 50-Pack
CONTRACTOR PACK
Triple BOX SHELL — 50 Pack
50 Triple BOX SHELLs. Best value for large projects — IECC 2024 compliant, no caulk required.
$129.99
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Ready to Seal It correctly?

Join contractors and builders across America who trust BOX SHELL to meet the highest energy performance standards without the extra labor or cost.

View All Products
Default Title 1x1 - Single BOX SHELL $2.39
Default Title 1x25 - Single BOX SHELL — Contractor 25-Pack $49.99
Default Title 1x50 Single BOX SHELL — Contractor 50-Pack $99.99
Default Title 2x1 Double BOX SHELL $2.49
Default Title 2x25 Double BOX SHELL — Contractor 25-Pack $59.99
Default Title 2x50 Double BOX SHELL — Contractor 50-Pack $119.99
Default Title 3x1 Triple BOX SHELL $2.79
Default Title 3x25 Triple BOX SHELL — Contractor 25-Pack $68.99
Default Title 3x50 Triple BOX SHELL — Contractor 50-Pack $129.99