These two closures are identical except for their end cable port configurations. In addition to a large oval port for the main distribution cable, the B2 closure has two large round ports for branch cable splices and the B4 closure has four small round ports for multiple drop applications.
The FOSC 400 cable sealing system provides a great deal of flexibility. For example, four small cables can be terminated in the two round ports of a
B2 closure with the use of branch-off clips. It is also possible to terminate three cables in the oval port of either closure.