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Wiegmann WAS350 4.00 inch hole seal steel disc

Wiegmann

Wiegmann WAS350 4.00 in Hole Seal Steel

SKU CH-958G-RS3FY

Carbon-steel hole seal closes 4.00 in unused push-button or conduit openings in 3.5 in conduit systems

  • Product typeElectrical Replacement Parts
  • Seals 4.00 in openings to block dust and moisture
  • Carbon steel construction resists impact and corrosion
  • Fits 3.5 in conduit knockouts for clean panel finish
  • Designed for unused pushbutton or conduit holes
  • Ready for immediate installation in new condition

Hole Seal for 4.00 in Openings

The Wiegmann WAS350 is a carbon-steel hole seal designed to close unused pushbutton or conduit holes measuring 4.00 in diameter. It suits electrical contractors and maintenance teams who need to restore enclosure integrity quickly and meet code requirements for sealed openings.

Replaces Open Knockout or Removed Fitting

This seal covers a 3.5 in conduit-size hole left after a pushbutton, pilot light or conduit fitting is removed, avoiding the cost and labour of swapping the entire enclosure. The jump is worth it when the opening is no longer needed but the box must stay rated and dust-tight.

Carbon Steel Material Limits

Carbon steel provides mechanical strength but lacks inherent corrosion resistance, so the seal is unsuitable for outdoor, wash-down or chemically aggressive environments unless the enclosure itself provides adequate protection or the seal is painted after installation.

How it compares

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

Price $22.99
Cheaper than about 66% of the 1,411 comparable items (median $39.99).

Specifications

Product
Brand nameWIEGMANN
Product typeElectrical Replacement Parts

Questions about this item

What hole diameter does the WAS350 seal cover?

The WAS350 covers a 4.00 in hole diameter and is designed for a 3.5 in conduit size, sealing unused pushbutton or conduit openings in electrical enclosures.

How is the WAS350 installed, and what step is commonly missed?

The steel seal mounts over the 4.00 in hole using the enclosure's existing hardware; the step often missed is ensuring the gasket seats evenly around the full perimeter before tightening to maintain a proper seal.

What maintenance or replacement will the WAS350 need over time?

Inspect the carbon steel seal and gasket periodically for corrosion or compression set; replace the unit if the gasket no longer compresses fully or if rust compromises the enclosure's environmental rating.

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