Sell Venturi Mask

venturi mask 1.Made of clear, non-toxic medical grade PVC; 2.Clear mask or coloured, comfortable for wear, amiable to face skin, and fitting face contour; 3.S,M,L,XL sizes of mask available； 4.Diluter size: blue for 24%, yellow for 28%, white for 31%, green for 35%, pink for 40% and orange for 50%; 5.With flexible corrugated tube 10-20cm, anti-crush; 6.With oxygen tubing, 8ft or 7ft long