Pack of 50 Disposable Cardboard Mouthpieces Fits the following units: Circadian Health Scan MicroLab 3300 Puritan Bennett PS600, VS400, PB900L Riko Spiromate, AS-300 Spirometrics Flow Mate, Spiroplus, SMI I, SMI II, SMI III Spirotube MIR Spirometers ... and many other brands Dimension of Mouthpiece: Outter Diameter 30mm (1.185" O.D.) Inner Diameter 28mm Length 64mm Pack of 50 Disposable Cardboard Mouthpieces
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