Features: 1) Advanced internal structure design 2) The closure is spacious enough for winding and storing fibers 3) Fiber optic splice tray (FOST) is designed in slide-in-lock and its opening angle is above 90 degrees 4) The curved diameter meets with international standard 5) Easy and fast to increase and reduce FOST 6) Innovative elastic integrated seal fitting 7) More easy and convenient for installation, maintenance and reuse