Allegro Supplied Air System, 15 psi, 2 HelmetsDescription Supplied Air System, Includes (2) 50 ft Breathing Hoses, (2) Shield Helmets, 1 1 2 hp Ambient Air Pump, Includes Headgear Yes, 9904, Helmet, Headgear Size Universal Dimensions Hose Length 50 ft Headgear Size Universal Hose Inside Diameter 3 8 in Details Item Supplied Air System For Use With Low Pressure Air Source Headgear Included Hard Hat Fittings OBAC Couplers OBAC Standards ANSI Z87. 1 2003, ANSI Z89. 1 Type 1 Class G, NIOSH Approved,