FOSC® 450 C6 Fiber Optic Splice Closure, Gel Cable sealing, no pre-installed tray, 6 cable attach., tall, six ground feedthrough lugs, with test valve Fiber Optic Splice Closures or Enclosures are used to hold and seal splices. Splice closures can be used in Aerial, underground or direct burried, pole/wall mount and pedestal or ground level applications. There are different types of closures such dome style, aerial terminal closures, runt closures, gator closures and many more.