Rescue Mask Training Adapter for the Prestan Professional Adult ManikinRescue Mask Training Adapter / adapter, air filter, flow, manikin, mask, masks, Prestan, rescue Use this affordable, disposable adapter in place of expensive mask valves for cost-effective training. Features integral air filter that obstructs flow of contaminants. Fits all standard rescue masks (15mm I.D. or 22mm O.D.). For training purposes only. Package of 10.