Portable multi-functional rapid response bottled air systems are ideal for confined space entry, hazmat, fire rescue, emergency response teams and water/sewage treatment facilities. Low-pressure alarm whistle, standard aluminum outlet manifold, in-line check valves and rear hose rack. Available in 2400 psi or 5000 psi. The 2400 psi units have CGA-346 wrench tight nuts and 4500 psi has CGA-347 hand-tight nuts. Cylinders ordered separately. Specify Hansen or Schrader fittings. Made in USA.