An enclosure includes a housing having sealing block arrangements disposed at corners of the housing. Each sealing block arrangement includes a containment wall to maintain sealant at the cable ports. A user can choose which corner ports are sealed or blocked by the sealing block arrangements. Each sealing block arrangement includes two volumes of sealant, a sealant containment wall, and two spring elements. Each containment wall includes containment elements that separate from each other to allow passage of a cable through the sealing block.