Portable Oxygen System Portable Oxygen System 38010 Includes: Demand Valve with O2 Q/C Fitting, Adult Full Face Mask, Cylinder Wrench, and Cart (gas cylinder not included). Where to Buy x Category Dealer PartnersSales RepresentativeStrategic MarketsSchools RepresentativeAccutron™ Equipment Sales Zip Code Find RepresentativeReset Select a category, input a zip code and click on Find Representative, or explore the complete list here.