... , and can be opened repeatedly. Convenient and quick operation, good air tightness.6.Connect the buried and overhead optical fiber cable lines ... the BoxAir TightnessPressure Resistance-406070160KPa≥1000N≥2000N16N·mFilled air pressure, 60KPa, 60. Leak no air.15KV/1min, Not puncture. No flied arc ...