LITGURU 24 Pcs 1 inch Knockout Seal Electrical Box Knockout Plugs Removable Seals for Conduit Pipe Assorted Sizes to Fit Unused Electrical Box Openings

Why I keep a bag of 1-inch knockout plugs in my kit

On more than one job, I’ve popped the wrong knockout in a steel box or found an old enclosure with a mystery hole left open. A strip of foil tape might keep the critters out for a week, but it’s not a proper fix. That’s where a simple, dependable knockout plug earns its place. After using the LITGURU knockout plugs across a handful of projects—garage upgrades, a small panel tidy-up, and a stack of junction boxes—I’m convinced they’re the kind of unglamorous consumable you want on hand.

Build and finish

These are stamped steel, silver-finished plugs designed for standard 1-inch knockouts. The finish reads as zinc-coated/galvanized, which blends nicely with most indoor steel boxes and takes paint without fuss once scuffed and primed. The metal thickness feels right: rigid enough to hold shape when you press them in, flexible enough for the spring tabs to bite and hold.

There were no sharp burrs or deformed tabs in the batch I used. Edges were consistent and the front face sat flat and clean against box surfaces. If you care about the look in visible locations, the low-profile face is easy to paint to match.

Fit and installation

Fit matters more than anything with a knockout plug—too loose and it rattles, too tight and you deform the box. These fit 1-inch “trade size” knockouts (not a literal one-inch hole; standard 1-inch knockouts are larger). In every standard steel box and panel knockout I tried, the LITGURU plugs seated snugly with an even snap.

Installation is as simple as:

• Clean the knockout edge and remove any burrs.
• Align the plug so both spring tabs start in the hole evenly.
• Press with your thumb; for tighter boxes, a light squeeze with pliers across the face helps it seat flush.

Removal is also doable without mangling the plug. I used a flat screwdriver to gently compress a tab from inside the box and the plug popped free. If you anticipate pulling them often, a tiny dab of dielectric grease on the tabs helps with reuse.

Sealing and protection

A snap-in plug will never be a gasketed, threaded seal, but these do what they’re supposed to: they close off unused openings to block dust, incidental moisture, and debris. In a sawdust-heavy garage and on a weather-protected exterior junction, they kept the interior clean and bug-free. The face contacts were uniform with no gaps. For raintight enclosures or truly wet locations, you’ll still want a listed raintight solution (threaded with a gasket); for general indoor and sheltered outdoor use, these deliver.

Compatibility and scenarios

I used them in:

• Standard 4-inch square and octagon boxes in steel
• A small subpanel side knockout
• A few metal device boxes during a retrofit

They dropped into each without fuss. They’re not for plastic boxes and not a substitute for a conduit bushing or a hub; they’re simply blanks for unused knockouts. The 24-count bag makes it easy to standardize on one size if you work a lot with 1-inch conduit. If you’re handling mixed sizes on the same project, you’ll still need 1/2-inch and 3/4-inch blanks in a separate kit.

Durability and corrosion

The spring tension stayed consistent after several installs and removals. I left one exposed in a damp basement utility space for a few weeks as a simple test—no discoloration or flaking. For outdoor boxes that get painted, I scuffed the face with a Scotch-Brite pad, hit it with metal primer, and top-coated; the paint adhered well and the face didn’t telegraph any odd texture.

The tabs didn’t fatigue with reasonable handling. If you pry them aggressively from the wrong side, you can bend a tab; that’s true of most stamped plugs. Keep a couple spares handy if you’re doing lots of rework.

Installation tips from the field

• Deburr the knockout edge: A quick pass with a reamer or file gives the tabs a clean bite and avoids shaving metal.
• Check the box wall thickness: On heavier-gauge enclosures, you may need a firm squeeze with pliers to seat the plug fully.
• Avoid overpainting before install: Paint build-up on the edge can make seating harder; paint after if you can.
• Mark sizes in your organizer: “1-inch” refers to conduit trade size; don’t mix them with 3/4-inch plugs in the same bin.

Code and safety notes

Closing unused openings is basic good practice and part of keeping enclosures compliant. For indoor dry locations, a tight-fitting snap plug like this is appropriate. If your jurisdiction or spec requires listed components for specific enclosures (UL mark, raintight rating, etc.), verify markings and choose accordingly. I didn’t see any printed markings on the faces of the plugs I used; that doesn’t preclude compliance, but it’s your responsibility to confirm requirements for critical installations.

Value and quantity

The practical win here is the 24-count pack. I go through more 1-inch blanks than I expect—especially on panel cleanups and commercial retrofits—and buying singles at a big-box store adds up fast. Having a full bag on hand means fewer interruptions and fewer “I’ll fix that hole later” notes. For the price of a couple small blister packs, you’re stocked for months.

Warranty and support

There’s a stated one-year warranty and lifetime technical support. I haven’t needed to use support for something as straightforward as a knockout plug, but it’s good to see the manufacturer standing behind the product. If a batch arrived with bent tabs or inconsistent tension, I’d expect an easy replacement.

What could be better

• Size options: This pack is 1-inch only. An assortment with 1/2-inch and 3/4-inch alongside 1-inch would serve most installers better.
• Markings: A discrete size stamp on the back and a listing mark (if applicable) would help with identification in the field.
• Pull-tab option: A small finger notch or pull tab on the interior side can make removal easier in tight panels.

None of these are deal-breakers, but they’re worth noting if you’re building out a comprehensive kit.

The bottom line

The LITGURU knockout plugs do exactly what I need: they fit standard 1-inch knockouts securely, sit flush and clean, resist corrosion, and install in seconds. They’ve handled everything from tidying accidental knockouts to buttoning up legacy boxes during renovations. They’re not a substitute for threaded, gasketed plugs in wet locations, and they’re not a universal assortment, but for the bulk of indoor and sheltered work they’re spot on.

Recommendation: I recommend these knockout plugs for anyone who regularly works with steel electrical boxes and needs a reliable, cost-effective way to seal 1-inch openings. The fit is consistent, the finish is durable and paint-friendly, and the 24-pack quantity keeps you prepared without overthinking it. If you require raintight or listed, marked components for specific environments, verify specs and choose accordingly—but for general use, these are a smart, no-drama addition to your electrical kit.