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Galvanised steel knockout seal, embossed centre, single screw, box of 100

Gardner Bender

Gardner Bender KO703 1in 16-gauge Steel Knockout Seal Conduit 100

SKU CH-2K0X-49HRJ

16-gauge galvanised steel knockout seals, 100 per pack, self-centre with a single screw

  • Embossed self-centering design speeds up knockout sealing
  • Single screw installation secures seal from inside or outside
  • Rust-proofed galvanized steel resists corrosion in electrical boxes
  • Zinc-plated hardware ensures durable fastening over time
  • Pack of 100 seals covers large conduit projects efficiently

16-gauge steel conduit seal

These Gardner Bender KO703 seals close unused 1-inch knockouts in electrical boxes. Made from rust-proofed, cold-rolled galvanized steel with zinc-plated hardware, they are sold in boxes of 100. Each seal is marked for size and catalogue number to simplify identification on the job site. They suit electricians and maintenance crews finishing conduit runs in commercial or residential work.

Sustained environmental resistance

The galvanised steel body and zinc-plated screw resist corrosion during long-term exposure in damp or outdoor locations. The embossed centre keeps the seal centred in the knockout while the single screw clamps it tight, preventing the seal from working loose through vibration or thermal cycling. The 16-gauge thickness maintains structural rigidity without deforming under normal panel stress. No moving parts or seals degrade over time.

Inside or outside mounting

Installation requires only a screwdriver and can be performed from either the interior or exterior of the box. The self-centering emboss eliminates guesswork, and the single-screw design reduces the chance of cross-threading or stripped threads. Common issues arise when the knockout diameter is oversized or the box metal is too thin for the screw to bite securely. Ensure the knockout matches the 1-inch nominal size before starting.

How it compares

Measured against everything we stock in Electrical Conduit & Fittings, at today’s prices. Recalculated every night.

Price $30.99
Typical for this category: the median of 1,290 items is $28.99.

Specifications

Product
Brand nameGardner Bender

Questions about this item

Does the 16-gauge steel seal heat up or make noise when conduit runs continuously?

The steel seal is a passive component with no moving parts, so it generates no heat and produces no audible noise during continuous conduit use.

What tools or fasteners must I already have to install the 1in knockout seal?

A standard screwdriver is required to drive the single zinc-plated screw that secures the seal in the knockout opening.

Will the 16-gauge steel seal fit older knockout boxes that use the same 1in size?

Yes, the seal is sized for standard 1in knockouts and its embossed self-centering design works with existing boxes of that diameter.

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