in operation a patient exhales into chamber 1 a one way valve diaphragm 100 lifts and the exhaled gas goes into chambers 2 3 and 4 some gas will go through port 5 into chamber 4 exhaled gas which goes into chamber 4 will turn the carbon dioxide indicator 96 to e g yellow from purple in an inhalation mode a resuscitator bag containing oxygen room air or other gases will go from chamber 6 into chamber 1 and into the patient some air or oxygen from 6 will also go into port 5 and into the chamber 4 exhaled gases will be pushed out of chamber 4 from chamber 4 the exhaled gases will go into chamber 2 then into chamber 3 and out into the atmosphere the carbon dioxide indicator will turn from yellow to purple after the exhaled gas has been removed the peep adapter 98 can be turned by rotating it on guide pins 102 holes in a switch seal 104 will move away from holes in an nrv housing 106 thus the seal will cover all the holes in nrv housing including port 5 in this position the carbon dioxide indicator will be isolated from the environment in an 34 off 34 position keeping the indicator from being degraded prior to use turning the peep adapter the opposite direction on the guide pins will.