An enclosure comprising: a housing having an end defining a sealing unit opening; a sealing unit (28, 128, 228, 428) that fits within the sealing unit opening, the sealing unit (28, 128, 228, 428) defining a plurality of cable ports (30, 430), the sealing unit (28, 128, 228, 428) including a sealant arrangement (32, 132, 232, 432) for defining and sealing the cable ports (30, 430) and for providing a peripheral seal between the housing and the sealing unit (28, 128, 228, 428); an actuation arrangement (31, 131, 231) for pressurizing the sealant arrangement (32, 132, 232, 432) within the sealing unit opening, the actuation arrangement (31, 131, 231) including inner and outer pressurization structures (60, 160, 260, 460, 62, 162, 262, 462) between which the sealant arrangement (32, 132, 232, 432) is positioned, the actuation arrangement (31, 131, 231) also including at least one actuator (35a, 35b, 135, 235, 435) that is movable between a non-actuated position and an actuated position, the actuator (35a, 35b, 135, 235, 435) for generating a seal pressurization force that presses the sealant arrangement (32, 132, 232, 432) between the first and second pressurization structures (60, 160, 260, 460, 62, 162, 262, 462) when the actuator (35a, 35b, 135, 235, 435) is moved towards the actuated position; and an indicator arrangement (40, 140, 240, 440) configured to indicate to a user that the actuator (35a, 35b, 135, 235, 435) is sufficiently moved to fully actuate the sealant arrangement (32, 132, 232, 432); wherein the actuator (35a, 35b, 135, 235, 435) includes a handle (36a, 36b, 136, 236, 436) threaded to a shaft (70a, 70b, 170, 270, 470) and a cap (74a, 74b, 174, 274) disposed between the handle (36a, 36b, 136, 236, 436) and a spring (52a, 52b, 152, 252, 452); and wherein either the indicator arrangement (40a, 40b, 140, 240, 440) includes at least one indicium (445, 447) disposed at an indicia region (I1, 12) located on the shaft (70a, 70b, 170, 270, 470); and wherein the handle (36a, 36b, 136, 236, 436) defines a window (45a, 45b, 443) through which the indicia region (I1, I2) may be visible; or the indicator arrangement (40a, 40b, 140, 240, 440) includes structures (171, 138, 237, 239, 272, 273) that align to indicate actuation of the sealant arrangement (32, 132, 232). a housing having an end defining a sealing unit opening; a sealing unit (28, 128, 228, 428) that fits within the sealing unit opening, the sealing unit (28, 128, 228, 428) defining a plurality of cable ports (30, 430), the sealing unit (28, 128, 228, 428) including a sealant arrangement (32, 132, 232, 432) for defining and sealing the cable ports (30, 430) and for providing a peripheral seal between the housing and the sealing unit (28, 128, 228, 428); an actuation arrangement (31, 131, 231) for pressurizing the sealant arrangement (32, 132, 232, 432) within the sealing unit opening, the actuation arrangement (31, 131, 231) including inner and outer pressurization structures (60, 160, 260, 460, 62, 162, 262, 462) between which the sealant arrangement (32, 132, 232, 432) is positioned, the actuation arrangement (31, 131, 231) also including at least one actuator (35a, 35b, 135, 235, 435) that is movable between a non-actuated position and an actuated position, the actuator (35a, 35b, 135, 235, 435) for generating a seal pressurization force that presses the sealant arrangement (32, 132, 232, 432) between the first and second pressurization structures (60, 160, 260, 460, 62, 162, 262, 462) when the actuator (35a, 35b, 135, 235, 435) is moved towards the actuated position; and an indicator arrangement (40, 140, 240, 440) configured to indicate to a user that the actuator (35a, 35b, 135, 235, 435) is sufficiently moved to fully actuate the sealant arrangement (32, 132, 232, 432); wherein the actuator (35a, 35b, 135, 235, 435) includes a handle (36a, 36b, 136, 236, 436) threaded to a shaft (70a, 70b, 170, 270, 470) and a cap (74a, 74b, 174, 274) disposed between the handle (36a, 36b, 136, 236, 436) and a spring (52a, 52b, 152, 252, 452); and wherein either the indicator arrangement (40a, 40b, 140, 240, 440) includes at least one indicium (445, 447) disposed at an indicia region (I1, 12) located on the shaft (70a, 70b, 170, 270, 470); and wherein the handle (36a, 36b, 136, 236, 436) defines a window (45a, 45b, 443) through which the indicia region (I1, I2) may be visible; or the indicator arrangement (40a, 40b, 140, 240, 440) includes structures (171, 138, 237, 239, 272, 273) that align to indicate actuation of the sealant arrangement (32, 132, 232).