Simple Adjustable Venturi Mask

The star lumen tubing can ensure oxygen flow even if the tube is kinked, different length of the tubing is available.
Features 7 color-coded diluters: 24%(blue) 4L/min, 28%(yellow) 4L/min, 31%(white) 6L/min, 35%(green) 8L/min, 40%(pink) 8L/min, 50%(orange) 10L/min, 60%(red) 15L/min
Safe, simple delivery of variable oxygen concentrations.
The product can be transparent green and transparent white.

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