Venturi mask-simple：

1.Made of clear,medical grade PVC.

2.With adjustable nose clip, elastic strap and latex free.

3.The mask material is soft and transparent, more comfortable and safer.

4.2 color coded diluters for seven concentrations.

5.Green diluter for 24%(3L/min), 26%(3L/min), 28%(6L/min), 30%(6L/min),

    White diluter for 35%(9L/min), 40%(12L/min), 50%(15L/min).

6.Longer and thicker anti-crush tube fits tightly and is less likely to leak.

7.Length: with 2 m tubing, different length can be customized.

Specification:XS，S，M，L，L+，XL。