a cable sealing insert having a length, a width and a thickness, the cable sealing insert having first and second opposite ends separated by the length of the cable sealing insert, the first and second ends having end surfaces that extend along the width and the thickness of the cable sealing insert, the cable sealing insert also including first and second opposite sides separated by the width of the cable sealing insert, the first and second sides having side surfaces that extend along the length and the thickness of the cable sealing insert, the cable sealing insert also including major front and rear sides separated by the thickness of the cable sealing insert, the major front and rear sides respectively including front and rear surfaces that extend along the width and the length of the cable sealing insert, the side surfaces and the end surfaces defining a perimeter shape of the cable sealing insert, and the cable sealing insert defining at least one cable pass-through location for routing a cable through the thickness of the cable sealing insert; and

a removable liner that adheres to the first and second sides of the cable sealing insert for facilitating inserting the cable sealing insert into a pocket of an enclosure, wherein the liner is removed from the cable sealing insert after the cable sealing insert has been inserted into the pocket; wherein the liner is substantially disposed on an outer surface of the cable sealing insert between the cable sealing insert and the pocket.