may be constructed to at least partially encompass the fiber optic cable 50 for example the compressible member 102 a may also include a portion fig4 a between the fiber optic cable 50 and one or both of the adjacent side walls 70 90 of the first compartment 94 and or a portion fig4 a between the fiber optic cable 50 and the one wall e g the top wall 58 of the chain link 54 a the bottom wall 62 of the chain link 54 c to at least partially fill space around the fiber optic cable 50 see fig4 in constructions in which the compressible member 102 a at least partially encompasses the fiber optic cable 50 the compressible member 102 a may also be sufficiently rigid such that a divider wall may not be provided to separate the fiber optic cable 50 from the service lines 38 42 46 the compressible member 102 a is positioned against the opposite wall e g the bottom wall 62 of the chain link 54 a the top wall 58 of the chain link 54 c in the illustrated construction see fig6 the surface of the opposite wall is curved to match the shape of the adjacent surface of the compressible member 102.