Professional CPR Training Mask Adaptors by PRESTAN Products 50-Pack. Use this affordable, disposable adapter in place of expensive mask valves for cost-effective training. Features integral air filter that obstructs the flow of contaminants. All PRESTAN Professional CPR Training Mask Adaptors come individually wrapped for sanitary assurance and convenience. 
 
Fits all standard rescue masks (15mm I.D. or 22mm O.D.). For training purposes only. Single-use only. Dispose of mouthpiece after use.