Eydm Series 25 Pct Fill Vertical Conduit Drain Sealing Fitting With Removable Nipple | 4 in Square Plenum Box Cover; Blank With Gasket and Two Captive Screws | "For 0.44 to 0.612 in Cable, 1.473 in Length X 1.2 | 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