a cylindrical portion of inhalation port 56 or exhalation port 52 the interior diameter of the fitting 40 is substantially the same diameter as the outside diameter of the cylindrical portion of the ports 52 56 when the fitting 40 is attached to one of the ports the interior surface of the fitting 40 is in sealing contact with the exterior surface of the port thus forming an air tight seal the fitting 40 may be molded integrally with the hose 30 or may be adapted to mate and form an air tight seal with the hose 30 this provides an air tight seal when the fitting 40 mates with inhalation port 56 or exhalation port 52 it should also be noted that the fitting 40 may be molded integrally with the pump 20 or likewise adapted to mate and form an air tight seal with a portion of pump 20 without utilizing a hose of any kind as shown in fig2 a the exhalation valve 54 is tested by removing the patient breathing circuit 94 and with pump 20 in the expanded state connecting the fitting 40 to the exhalation port 52 the pump 20 is then used to create a positive pressure at the fitting 40 and to force air into exhalation port 52 if the pump 20 cannot force air into the exhalation port 52 then the valve is defective the pump is then released and allowed to expand thus creating a negative pressure at the fitting 40 if the pump 20 expands then the valve is not sealing properly as no air should be allowed to be escape from the exhalation port as shown in fig2 b the inhalation valve 58 is tested by removing the.