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Do not base your order on the picture presented.
The valve is an Accessory for the ADC Adsafe CPR Pocket Resuscitator. Dimensions: 1.38" x 1.25" x 1.25". Item shown is ADC4053 - the complete Adsafe pocket resuscitator. Arrow is pointing to the valve. More information on the complete Adsafe™ CPR Pocket Resuscitator can be found by searching for model # ADC4053.