ESU 25 Percent Fill Conduit Sealing Fittings

25%* Fill. Vertical.
Explosionproof, Dust-Ignitionproof, Raintight.
Unilets® for Use with Threaded Rigid Metal Conduit and IMC.

  • Class I, Division 1 and 2 Groups C, D
  • Class II, Division 1 and 2 Groups E, F, G
  • Class III

These sealing fittings minimizes the passage of gases and vapors and prevents the passage of flames from one portion of a conduit system to another. They prevent pressure piling the within conduit system and contain any explosion that occurs. The ESU Series provides a pouring spout that rotates 90° for sealing vertical or horizontal conduit.


ESU 25 Percent Fill Vertical and Horizontal Conduit Sealing Fittings Catalog Pages

Applications Features Catalog Numbers Product Downloads Related Products
  • For sealing vertical conduit
  • Prevent pressure piling within conduit system
  • Required in Class I, Division 1 and 2 locations:
  • Within 18" of enclosures containing apparatus that may cause arcs, sparks or high temperatures
  • Where 2" or larger conduit enters enclosure, fitting housing terminals, splices or taps
  • At the boundary where conduit leaves classified location
  • Where two or more enclosures are connected by 36" or less conduit (seal must be located within 18" of either enclosure)
  • Required where cables (which exceed rate of gas or vapor transmission permitted for seals) are used in Class I, Division 2 locations

* Per NEC 501.15(C)(6) seals in Class I, Division 1 and 2 must be limited to conductor fill of 25% of cross sectional area of a rigid metal conduit of the same trade size unless approved for higher percentage fill. See 40% fill sealing fittings.


ESU 25 Percent Fill Vertical and Horizontal Conduit Sealing Fittings


EGS Petrochem Brochure

EGS Petrochem Brochure