Check the listing for details. Ever Ready First Aid CPR Rescue Mask Training Valves - 10 Pack. Condition: New. Listed at 8.95 USD. Pack of 10 CPR Rescue Mask Training Valves Ever Ready First Aid REALISTIC AND EFFECTIVE TRAINING: The Ever Ready Training Valves give students the most realistic rescue mask training experience possible as they duplicate field-use rescue valves in form and function. EASY USE: The valves are easy to use, latex free, and have an integral air filter that obstructs the flow of contaminants. COST EFFECTIVE: Teaching with rescue masks can be costly when constantly replacing valves. Now you can get the most from your dollars with Ever Ready First Aid's affordable, individually wrapped, single-use training valves. UNIVERSAL FIT: The Ever Ready First Aid Training Valves fit all cpr masks that use standard valves. They are made to fit on the inside opening of all adult masks, as well as infant mask openings. 10 VALVES PER PACKAGE: The box contains 10 valves per package, not including a rescue mask. The valves must be discarded after single use as they are one-time-use valves.