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Four-inch threaded aluminum conduit bushing with zinc-plated finish

L.H. DOTTIE

L.H. DOTTIE GBL400 Conduit Bushing 4 in Threaded Aluminum Zinc Plated

SKU CH-ZE5W-N84YP

Threaded aluminium conduit bushing with zinc plating protects cables in 4-inch fittings

  • Product typeCable Management & Conduit
  • 4 in threaded conduit bushing protects cable insulation
  • Zinc-plated aluminium resists corrosion in damp locations
  • DOTTIE brand fitting meets conduit installation requirements
  • Threaded design allows secure attachment to conduit ends
  • 400 model suits standard 4 in conduit systems

Conduit Bushing 4 in Threaded Aluminium Zinc Plated

This L.H. DOTTIE GBL400 conduit bushing provides a threaded aluminium fitting for 4 in conduit runs. The zinc-plated surface resists corrosion in damp or outdoor environments. It is designed for electricians and maintenance crews who need a reliable transition point in rigid or intermediate metal conduit systems. The component meets standard conduit fitting requirements for commercial and industrial installations.

Zinc Plating and Threaded Design

The zinc plating adds a sacrificial layer that slows oxidation on the aluminium body, extending service life in exposed locations. Threaded ends allow direct connection to conduit couplings or enclosures without additional adapters. This reduces the number of separate parts required on site and speeds up assembly. The combination of aluminium construction and zinc coating keeps the fitting lightweight while maintaining mechanical strength.

Suited for 4 in Conduit Projects

This bushing suits contractors pulling conductors through 4 in trade-size conduit where a threaded aluminium fitting is specified. It is not intended for non-threaded conduit systems, smaller trade sizes, or applications that require insulated throat bushings. Buyers needing PVC, stainless steel, or non-metallic conduit fittings should select a different product line. Always verify local code requirements before installation.

How it compares

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

Price $69.99
Pricier than about 77% of the 1,290 comparable items (median $28.99).

Specifications

Product
Brand nameDOTTIE
Product typeCable Management & Conduit

Questions about this item

Will the zinc-plated aluminum threads on the GBL400 bushing corrode or require re-tapping after years in damp conduit runs?

The zinc plating protects the aluminum threads from corrosion in typical damp locations; no re-tapping is needed unless the threads are physically damaged during installation.

What mechanical limit appears first when the 4-inch threaded bushing is subjected to continuous cable-pull tension?

The aluminum body will deform before the zinc plating wears, so the deformation limit of the 4-inch threaded hub is the first constraint under sustained pulling force.

Does the GBL400 generate noticeable heat or noise when conduit carries full-load conductors all day?

As a passive threaded fitting with no moving parts or electrical resistance, the bushing produces no heat and no audible noise regardless of conductor load.

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