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Will this fit a 1/2-inch knockout?Can I use these outdoors?How many closure plugs are included?Is it safe to use?What tools are needed for installation?

Sigma Engineered Solutions 8 -Pack 0.5-in and 0.75-in Multiple colors/finishes Plastic Electrical Box Knockout Plug

Name: Sigma Engineered Solutions 8 -Pack 0.5-in and 0.75-in Multiple colors/finishes Plastic Electrical Box Knockout Plug
Brand: Sigma Engineered Solutions
SKU: 1000500213
Price: 1.78 USD
Availability: InStock
Rating: 4.8 (16 reviews)

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4.8

Stepper number input field with increment and decrement buttons

Pickup

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Shipping

Sat, Sep 5

57 available

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Sigma's weatherproof closure plugs help keep moisture from the electrical wiring by closing unused holes in weatherproof boxes, extension rings or covers.

Plugs are for closure of 1/2-in threaded knockouts in a weatherproof box, extension ring or cover
Non-metallic construction
Includes (2) 1/2" gray closure plugs, (2) 3/4" gray closure plugs, (2) 1/2" bronze closure plugs and (2) 1/2" white closure plugs
Product is cULus listed

General
Color/Finish Family	Multiple colors/finishes	Package Quantity	8
Material	Plastic

Dimensions
Diameter (Inches)	0.5	Fits Opening	0.5-in and 0.75-in
Height (Inches)	0.3

Certifications
CA Residents: Prop 65 Warning(s)	Prop 65 Warning(S)

Warranty
Warranty	None

Miscellaneous
UNSPSC	39121300

Check out the Best Selling Electrical Box Knockout Plugs on Lowes.com

Review

4.8 out of 5

16 Reviews

2 Star

1 Star

92% Recommend this product

Ratings may include incentivized customer reviews.

16 Customer Reviews

Sort By

Heavy duty

Would Recommend

New house build. Husband only buys the best for projects.

SWILJune 29, 2026
Verified Purchaser

Was this Review Helpful ?

Perfect for my electrical needs

Would Recommend

It worked

PennyJune 22, 2026
Verified Purchaser

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Good Caps

Would Recommend

I like that there are various sizes and colors, they appear to be of a good material, and they fit snug.

TonyNovember 6, 2025
Verified Purchaser

Was this Review Helpful ?

Good buy

Would Recommend

Everywhere else was pricey. Perfect fit

nice79guyOctober 24, 2025
Verified Purchaser

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All sizes

Would Recommend

Needed to clean up old wires. This had all sizes to fill the holes.

KrisHOctober 23, 2025
Verified Purchaser

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Random Asssortment

Would Not Recommend

Advertised 8-pack of 0.5-in and 0.75-in pieces. I received (1) 1.0-in and (6) o.5-in pieces. The 0.5-in pieces came in three colors; white, gray, black.

OldBuckNovember 15, 2023
Verified Purchaser

Was this Review Helpful ?

electrical

Would Recommend

work ok

jddmarineJune 18, 2023
Verified Purchaser

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Sigma Engineered Solutions: Featured Videos

COMPARE PRODUCTS

		Name	Current Item Sigma Engineered Solutions8 -Pack 0.5-in and 0.75-in Multiple colors/finishes Plastic Electrical Box Knockout Plug
		Ratings	16
		Material	Plastic
		Fits Opening	0.5-in and 0.75-in
		Height (Inches)	0.3
Hubbell4 -Pack 0.5-in Gray Metal Electrical Box Knockout Plug	Sigma Engineered Solutions0.5-in Multiple colors/finishes Plastic Electrical Box Knockout Plug	Sigma Engineered Solutions0.5-in Gray Metal Electrical Box Knockout Plug	Hubbell4 -Pack 0.75-in Gray Metal Electrical Box Knockout Plug
19	10	31	19
Metal	Plastic	Metal	Metal
0.5-in	0.5-in	0.5-in	0.75-in
0.813	0.3	0.3	1.031