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Your cart is empty.Sigma's knockout seals are used to close exposed holes in an outlet box or metal enclosure.
Wylie M.
Reviewed in the United States on February 9, 2025
The retention clips are not as well defined as you see in the picture. I had to modify each one by hand to hold correctly. It's what one expects from cheap Chinese quality control standards nowadays.
Katrina
Reviewed in Canada on September 26, 2024
My husband told me to buy this so that he could use an old box with a different spot for the cut out. It worked perfectly as intended and he is very happy
Douglas LaCroix
Reviewed in the United States on September 17, 2024
They work exactly as intended. I was able to salvage a couple used boxes by installing the plugs. Worth the many. I keep some with me know when I'm on a job in case I knock out the wrong hole. Beats replacing the box.
David G
Reviewed in the United States on May 19, 2024
I used this to seal a 3/4 knockout on a 4 sq box. These seals do work on a knockout punch meant for 3/4 size conduit.
Mike
Reviewed in the United States on March 19, 2024
These work perfect when you need to fill a knock hole out you no longer need or accidentally made.
Paul Rodriguez
Reviewed in the United States on February 13, 2024
Order accordingly.
Colin
Reviewed in the United States on August 29, 2023
Like everybody else, I didn't read the reviews first. These knockouts are stamped with 3/4", but the actual diameter of the tabs is > 1".I believe the 3/4" is based on nominal conduit size, so these are (rightly for holes that are ~1.125"). For a 3/4" sized hole, I think I would have needed a 3/8" plug, which would be slightly undersized, or 1/2", which would be slightly oversized.
CJ
Reviewed in the United States on December 1, 2023
As advertised
Customer
Reviewed in the United States on April 24, 2022
Just tried to fit this and it was way too large, the overall star rating seemed decent when I ordered, no idea how it is calculated but I am reading other reviews and everyone agrees with me, this is way too large and not 3/4 inch. I also checked manually, way too large, what a terrible product
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