One-Way Mouthpieces - Adult Expiratory - Safe-T-Way
One-Way Mouthpieces - Adult Expiratory - Safe-T-Way

One-Way Mouthpieces - Adult Expiratory - Safe-T-Way

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Peak Flow Mouthpieces - One-Way - Adult Expiratory 

x200

Individual mouthpieces for Peak Flow Meter and Spirometers

The mouthpieces are one-way valved for hygiene purposes, but have low air resistance so readings are not invalidated