Eys Series 25 Pct Fill Vertical and Horizontal Sealing Fitting | 1.51 in Length X 2.12 in Height, 0.42 in Thread Length, for Armored Cable, Flexible Metal Conduit and Metal Clad Cable | For Preventing Passage of Gases, Vapors or Flames From One Portion of Conduit System to Another; Required in Class I, Division 1 and 2 Locations Within 18 in of Enclosures Containing Apparatus That May Cause Arcs, Sparks or High Temperatures; Required in CFurbay Electric Supp