青青操在线视频,国产丝袜精品观看一二三区,极品尤物在线自慰,国产国拍亚洲

GFY series of air shutter is used for pneumatic conveying and dust removal system. It can close the air of the discharging and receiving materials to ensure the normal discharging and receiving. The machine has reliable performance, good wind closing effect, low power consumption, low noise, observation window for organic glass with high strength and good transparency.