Dust Cap For Coupling - SK23S Cejn 341, 342, 343, 344, 345 and 346 Flow Rate: 1800 L/Min Material: Brass Nickel Plated, Nitirle Seal (Standard Series Coupling) Application: Single Shut Off Quick Connect Coupling Commonly used on Portable Breathing Air Kits and Hose Line Trolley Packs