Fengyu's vacuumzing and refilling device is used for SF6 electrtic device to vacuum and refill gas. specification: VCH-14\28\54\252\500vacuum pump: 14M3, 28M3, 54M3VCH series for vacuumzing and refilling of gas, movable, with flexible pipe and joints DN8 and DN20, max vacuum pressure less than 10Pa. Sulfur Hexafluoride SF6 gas vacuuming and refilling equipment