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Main parts are made of silicon;
Aspirator valve is equipped with the fish mouth shape valve, which will close during respiration to avoid occurring flow backwards;
Be equipped with the pressure limit valve avoiding the higher pressure output;
The device is composed of Air bag, Aspirator valve, Collection air bag, Mask, Fish mouth shape valve;
With three models: HF-I (suit for neonate or infant under 2 years);
HF-II (suit for 2-7 years old children);
HF-III (suit for adult).
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