... FTU. 2. Suitable for auto-system Product Features1. The Sf6 gas box material used stainless steel principal axis, the switching loop ... and operating mechanism all sealed in SF6 gas.2. Adopt SF6 and vacuum insulation, the outside is silicone rubber bushing ... leakage distance more than 513mm.3. The inner adopt SF6 insulation, (gas pressure:0.13Mpa),pressure swich and pressure gauge are ...