The One-Way Valve Mouthpiece is a disposable paper mouthpiece featuring a one-way valve for expiratory-only testing. The plastic valve has been designed to provide low air resistance. This mouthpiece features a 1 3/16 inch outside diameter, the same diameter as our popular paper mouthpiece #162600.
One-Way Valve for expiratory-only testing
Strong, durable construction
Special design provides low air resistance
1 3/16" (30.2mm) Outside Diameter
100 per case