An enclosure comprising: a housing having an end defining a sealing unit opening; a sealing unit that fits within the sealing unit opening, the sealing unit including a sealant arrangement that defines a plurality of cable ports, the sealant arrangement also being configured for providing a peripheral seal between the housing and the sealing unit, the sealing unit also including an actuation arrangement for pressurizing the sealant arrangement within the sealing unit opening, the actuation arrangement including inner and outer pressurization structures (60, 62) between which the sealant arrangement is positioned, the actuation arrangement including a spring for applying a pressurization force that causes the sealant arrangement to be pressurized between the inner and outer pressurization structures (60, 62) when the actuation arrangement is actuated, wherein the sealant arrangement includes a plurality of sealing modules (33a-33e) each sized to form only a portion of the pressure actuated sealant arrangement, the sealing modules (33a-33e) being individually installable between the inner and outer pressurization structures (60, 62) and being individually removable from between the inner and outer pressurization structures (60, 62), each sealing module (33a-33e) having a total axial length that extends between first and second axial ends (70, 72) of the sealing module (33a-33e) along a central axis of the sealing module (33a-33e), the sealing modules (33a-33e) each including a volume of sealant at least partially contained between first and second axial containment structures (76, 78), the first and second axial containment structures (76, 78) forming the first and second axial ends (70, 72) of the sealing modules (33a-33e), the sealing modules (33a-33e) each defining at least one of the cable ports, the cable ports extending axially through the volumes of sealant, the volumes of sealant including cable sealing surfaces that extend around the cable ports, the volumes of sealant also including exposed outer sealing surfaces that surround peripheries of the sealing modules (33a-33e); wherein the volumes of sealant of the sealing modules (33a-33e) each include at least first and second sealing parts (74a, 74b) that can be separated to allow for lateral cable insertion into the sealing modules (33a-33e), and in that the first and second axial containment structures (76, 78) of the sealing modules (33a-33e) each include first and second containment parts (76a, 76b, 78a, 78b) corresponding to the first and second sealing parts (74a, 74b); and wherein portions of the exposed outer sealing surfaces cooperate to form the peripheral seal between the housing and the sealing unit. a housing having an end defining a sealing unit opening; a sealing unit that fits within the sealing unit opening, the sealing unit including a sealant arrangement that defines a plurality of cable ports, the sealant arrangement also being configured for providing a peripheral seal between the housing and the sealing unit, the sealing unit also including an actuation arrangement for pressurizing the sealant arrangement within the sealing unit opening, the actuation arrangement including inner and outer pressurization structures (60, 62) between which the sealant arrangement is positioned, the actuation arrangement including a spring for applying a pressurization force that causes the sealant arrangement to be pressurized between the inner and outer pressurization structures (60, 62) when the actuation arrangement is actuated, wherein the sealant arrangement includes a plurality of sealing modules (33a-33e) each sized to form only a portion of the pressure actuated sealant arrangement, the sealing modules (33a-33e) being individually installable between the inner and outer pressurization structures (60, 62) and being individually removable from between the inner and outer pressurization structures (60, 62), each sealing module (33a-33e) having a total axial length that extends between first and second axial ends (70, 72) of the sealing module (33a-33e) along a central axis of the sealing module (33a-33e), the sealing modules (33a-33e) each including a volume of sealant at least partially contained between first and second axial containment structures (76, 78), the first and second axial containment structures (76, 78) forming the first and second axial ends (70, 72) of the sealing modules (33a-33e), the sealing modules (33a-33e) each defining at least one of the cable ports, the cable ports extending axially through the volumes of sealant, the volumes of sealant including cable sealing surfaces that extend around the cable ports, the volumes of sealant also including exposed outer sealing surfaces that surround peripheries of the sealing modules (33a-33e); wherein the volumes of sealant of the sealing modules (33a-33e) each include at least first and second sealing parts (74a, 74b) that can be separated to allow for lateral cable insertion into the sealing modules (33a-33e), and in that the first and second axial containment structures (76, 78) of the sealing modules (33a-33e) each include first and second containment parts (76a, 76b, 78a, 78b) corresponding to the first and second sealing parts (74a, 74b); and wherein portions of the exposed outer sealing surfaces cooperate to form the peripheral seal between the housing and the sealing unit.