An enclosure for use in a fiber optic distribution network, the enclosure comprising: a housing defining a housing interior and a cable seal opening; a cable seal (36, 36') mounted within the cable seal opening, the cable seal defining a major cable port; a cable anchoring station positioned within the housing interior for anchoring a cable relative to the housing, the cable anchoring station including a cable clamping location in alignment with the cable seal opening; a one-piece port size reducer plug (42a, 42b) defining a minor cable port (46a, 46b) that extends through a length of the port size reducer plug, the port size reducer plug having first and second portions (80a, 80b, 82a, 82b) positioned along the length of the port size reducer plug, the port size reducer plug (42a, 42b) being sized and shaped such that the first portion (80a, 80b) of the port size reducer plug (42a, 42b) is configured to fit within the major cable port and the second portion (82a, 82b) of the port size reducer plug (42a, 42b) is configured to fit within the clamping location; and a one-piece blind plug (48a, 48b) that fits within the minor cable port (46a, 46b), the blind plug having a first extent (102a, 102b) that coincides with the first portion of the port size reducer plug and a second extent (104a, 104b) that coincides with the second portion of the port size reducer plug, the first extent (102a, 102b) filling the minor cable port (46a, 46b) at the first portion (80a, 80b) of the port size reducer plug to seal the minor cable port (46a, 46b) when the minor cable port (46a, 46b) is not in use, the second extent (104a, 104b) filling the minor cable port (46a, 46b) at the second portion (82a, 82b) of the port size reducer plug to limit void space within the second portion (82a, 82b) such that the second portion (82a, 82b) does not excessively deform within the clamping location of the cable anchoring station, characterised in that the minor cable port (46a, 46b) has a transverse cross-sectional shape that is fully enclosed at the first portion (80a, 80b) of the port size reducer plug (42a, 42b) and that has an open side at the second portion (82a, 82b) of the port size reducer plug (42a, 42b). a housing defining a housing interior and a cable seal opening; a cable seal (36, 36') mounted within the cable seal opening, the cable seal defining a major cable port; a cable anchoring station positioned within the housing interior for anchoring a cable relative to the housing, the cable anchoring station including a cable clamping location in alignment with the cable seal opening; a one-piece port size reducer plug (42a, 42b) defining a minor cable port (46a, 46b) that extends through a length of the port size reducer plug, the port size reducer plug having first and second portions (80a, 80b, 82a, 82b) positioned along the length of the port size reducer plug, the port size reducer plug (42a, 42b) being sized and shaped such that the first portion (80a, 80b) of the port size reducer plug (42a, 42b) is configured to fit within the major cable port and the second portion (82a, 82b) of the port size reducer plug (42a, 42b) is configured to fit within the clamping location; and a one-piece blind plug (48a, 48b) that fits within the minor cable port (46a, 46b), the blind plug having a first extent (102a, 102b) that coincides with the first portion of the port size reducer plug and a second extent (104a, 104b) that coincides with the second portion of the port size reducer plug, the first extent (102a, 102b) filling the minor cable port (46a, 46b) at the first portion (80a, 80b) of the port size reducer plug to seal the minor cable port (46a, 46b) when the minor cable port (46a, 46b) is not in use, the second extent (104a, 104b) filling the minor cable port (46a, 46b) at the second portion (82a, 82b) of the port size reducer plug to limit void space within the second portion (82a, 82b) such that the second portion (82a, 82b) does not excessively deform within the clamping location of the cable anchoring station, characterised in that the minor cable port (46a, 46b) has a transverse cross-sectional shape that is fully enclosed at the first portion (80a, 80b) of the port size reducer plug (42a, 42b) and that has an open side at the second portion (82a, 82b) of the port size reducer plug (42a, 42b).