The FOSC name has been synonymous with excellence in sealing, fiber management, ease of use, and design flexibility since the FOSC 100 closure was first introduced in 1986. FOSC closures have always been engineered specifically for fiber optic applications; they are not modified copper closures. The difference shows-ask someone who has worked with the product.

FOSC 400 closures combine proven fiber management hardware with a highly reliable sealing system. Base-to-dome seals on FOSC400 closures are mechanical for ease of installation and re-entry, and cable seals feature a unique Raychem heat-shrink sleeve and hot-melt adhesive system that is installed with a hot-air gun. Common materials, accessories, and practices are used throughout the product line to simplify training, reduce inventory, and enhance productivity.

FOSC 400 fiber optic splice closures are available in three sizes; the FOSC 400 A, FOSC 400 B, and FOSC 400 D. All sizes are designed for use with any cable construction (loose buffer tube, central core tube, loose fiber, and ribbon), in any environment (aerial, pedestal, buried, handhole, and manhole), and for numerous splice applications (express, tap-off, branch, and repair).