... well as φ20 stainless steel coil. Circulating system uses pneumatic diaphragm pump cycle, diameter: 1 / 2", material: PP. Electronic ... includes a perfume making tank, an USA imported air diaphragm pump, a static/air-powered agitator, chilling system, filtering and piping ... a perfume making machine, an USA imported air diaphragm pump, a static/air-powered agitator, chilling system, filtering and piping ...