1. Fabricated by mixing the imported material and other chemical assistant agent (ageing resistance & ultraviolet radiation resistance), increase of service life
2. Base-to-dome seals on FOSC are mechanical and heat-shrinkable for ease of installation and reentry. No other sealing adhesive tape is needed
3. Base and dome sealed with clamp and O-ring system
4. The splice trays are hinged for access to any splice without disturbing others trays
5. The inner parts and fixing parts are made of stainless steel
6. FOSC with a grounding device protect it from damage by lightning
7. No special tools are needed to open the closure, and it can be opened and used repeatedly.