Ratings & Reviews for Sigma ProConnex 1-1/2-in Zinc-plated steel Knockout Seal Conduit Fittings
Ratings may include incentivized customer reviews.
What Customers Are Saying
Customers overwhelmingly praise these plugs for their tight, secure fit and reliable performance in sealing unused electrical box holes without tools. Most highlight the metal construction feels durable and professional, effectively keeping out pests and dust while meeting code compliance. Installation is quick and simple—users appreciate solving unexpected knockout issues without costly replacements. A few report sizing discrepancies between labeled and actual dimensions, and some note the snug fit requires leverage to install. Overall, reviewers consider them an essential, practical solution for electrical maintenance.
Customer review summary generated by AI, including incentivized reviews.Easy to install
Would RecommendFirmly fit
From 1_SLASH_2-in Zinc-plated steel Knockout Seal Conduit Fittings Verified Purchaser
Works as needed
Would RecommendFitted and easy to install
From 3_SLASH_4-in Zinc-plated steel Knockout Seal Conduit Fittings Verified Purchaser
Easy!
Would RecommendThe plug is easy to snap into place — like the knockout was never removed.
From 3_SLASH_4-in Zinc-plated steel Knockout Seal Conduit Fittings Verified Purchaser
Excellent!
Would RecommendPerfect for closing an unused knockout!
From 3_SLASH_4-in Zinc-plated steel Knockout Seal Conduit Fittings Verified Purchaser
Does what it’s supposed to do
Would RecommendFit perfectly.
Unable to judge
Would RecommendUnfortunately, it did not fit the hole in my junction box. The hole must be between sizes.
From 3_SLASH_4-in Zinc-plated steel Knockout Seal Conduit Fittings Verified Purchaser
Perfect fit at a great price
Would RecommendGreat quality
From 1-1_SLASH_4-in Zinc-plated steel Knockout Seal Conduit Fittings Verified Purchaser
Snaps into place
Would RecommendEasy way to plug open holes in the junction box when wires are removed.
From 1_SLASH_2-in Zinc-plated steel Knockout Seal Conduit Fittings Verified Purchaser
Dose not fit the boxes I bought
Would Not RecommendDid not work like I thought
From 1_SLASH_2-in Zinc-plated steel Knockout Seal Conduit Fittings Verified Purchaser
Doesn’t get any easier than this
Would RecommendEasy to install no tools required
From 1-1_SLASH_4-in Zinc-plated steel Knockout Seal Conduit Fittings Verified Purchaser
Works as it should
Would RecommendI was able to fill an old void without having to replace the whole electrical box
Inexpensive fix.
Would RecommendPlugs holes like it should.
From 1_SLASH_2-in Zinc-plated steel Knockout Seal Conduit Fittings Verified Purchaser
Perfect for missing/open holes in breaker panel.
Would RecommendEasy to find, install and did the job perfectly
Verified Purchaser
They work well with a little finesse.
Would RecommendThese are a little stiff to insert but doable with a little bending of the fingers. They are also a bit pricy.
From 1_SLASH_2-in Zinc-plated steel Knockout Seal Conduit Fittings Verified Purchaser
Thank you for your feedback of this Knockout Seal. We’re sorry to hear the knockout seal didn’t fit the boxes you purchased or work as expected. Knoc...