Tianjin, Chongqing dealers universal universal exhaust hood exhaust hood exhaust hood distributor Jinan factory direct universal joints: High density PP material, can adjust the direction of 360 degree rotation, easy to dismantle, restructuring and cleaning Joint seals: easy aging of high-density rubber support spring / joint connecting rod: 304 stainless steel joint tension knob: All copper material, embedded stainless steel bearings, in the joints connecting rod lock Flow control valve: manual adjustment of external valve knob to control the air flow entering. Arch / cup-shaped collection hood: diameter 375mm, made of high density PP, red, white and transparent three options. Telescopic catheter: Diameter 75mmPP unique 360 ??° rotating device: the holder of the largest activity center radius of up to 1600mm fixed base: high density ABS material, non-adhesive made of one-piece injection mold, fastness, no slackness Description : PP material for acid / corrosion / heat / aging / anti-wrestling, etc., in line with the laboratory environment and security needs.