Communication Markets Division 3M Fiber Optic Splice Closure 2178 Family Flexible Fiber Management SolutionsMore flexibility for your complex fiber optic network A full line of closures and accessories designed to protect fiber optic facilities. The 3M Fiber Optic Splice Closure 2178 family has earned its reputation for reliable protection of fiber optic facilities. Now, the 2178 family includes many models and congfi urations for more flexibility to help meet the complex needs of todays fiber optic networks. Growing technologies require growing solutions. You want to build reliable FTTP networks faster and cheaper. The expanded 3M Fiber Optic Splice Closure 2178 family can help you meet these needs for most applications (including aerial, buried, underground, vault and building entrance) and cables (including loose bueff r tube, tight bueff r tube, central tube, discrete fiber, ribbon fiber, armored or dielectric). 2