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Silver aluminium IMC conduit plug, threaded male ends, plain finish

Appleton Century Crofts

Appleton Century Crofts PLG-250A IMC Plug Conduit

SKU CH-49WM-7EXPR

Threaded aluminum plug seals 2-1/2 inch IMC conduit in hazardous locations

  • TypeCable Management & Conduit
  • Seals hazardous-location conduit runs with Class I, II, III Division 1 and 2 ratings
  • Male-to-male threaded design fits 2-1/2 inch IMC and RMC conduit directly
  • Aluminium construction with plain finish resists corrosion in demanding industrial environments
  • Compact 5/8 inch overall length allows installation in tight junction-box spaces
  • Blank plug configuration closes unused conduit openings while maintaining hazardous-area compliance

Application and Purpose

The Appleton Century Crofts PLG-250A is a 2-1/2 inch threaded aluminum conduit plug designed for hazardous-location electrical installations. It seals unused openings in Intermediate Metal Conduit systems rated for Class I, Division 1 and 2, Groups A, B, C, D environments. The plain silver finish provides corrosion resistance in demanding industrial settings. This fitting suits maintenance teams and electricians securing conduit runs in classified areas.

Replacement and Upgrade Context

This plug replaces damaged or missing hazardous-location seals on 2-1/2 inch IMC or threaded rigid metal conduit systems. The upgrade is justified when existing fittings no longer maintain the required Class I and Class II division ratings for Groups A through G. It restores code compliance where open conduit entries expose the raceway to ignitable gases, vapours or combustible dusts. The straight male-to-male NPT threads allow direct installation without adapters.

Sustained Load Behaviour

Under continuous service the aluminum body resists corrosion from chemical atmospheres common in Class I and II locations. The threaded joint maintains its seal integrity despite thermal cycling and vibration in heavy industrial plants. The hazardous-location rating remains valid as long as the threads are properly engaged and the fitting is undamaged. The plain finish withstands prolonged exposure without degrading the protective properties required for Division 1 and 2 areas.

Highlights

  • Seals hazardous-location conduit runs with Class I, II, III Division 1 and 2 ratings
  • Male-to-male threaded design fits 2-1/2 inch IMC and RMC conduit directly
  • Aluminium construction with plain finish resists corrosion in demanding industrial environments
  • Compact 5/8 inch overall length allows installation in tight junction-box spaces
  • Blank plug configuration closes unused conduit openings while maintaining hazardous-area compliance

Specifications

BrandAPPLETON ELECTRIC
TypeCable Management & Conduit

Questions about this item

What thread size does the PLG-250A plug need to seal a 2-1/2 in IMC conduit?

It uses a 2-1/2 in male NPT thread that matches the trade size of IMC and threaded rigid conduit.

Which step is often missed when threading the aluminum plug into a hazardous-location fitting?

Applying a listed thread compound for Class I Division 1 Groups A–D and Class II Groups E–G before tightening to the required engagement.

When should the plain-finish aluminum plug be inspected or replaced in a Class III installation?

Inspect during each scheduled conduit-system audit and replace if threads show galling, corrosion or the hazardous-location rating label becomes illegible.

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