The standard size of bottle provided is 11 gal. with 1-1/4" NPT ports, bottom loading bladder type, 3000 psi working pressure. The manifold is machined complete from 4.5" O.D. mechanical tubing - 5000 psi standard working pressure. There are as many as four (which are required by API-16D) manifold assemblies per unit which allows for maintenance without completely losing the ability to operate. Additional Subsystem parts include Bottle Racks, Bottle Header Manifold, Charging & Gauging Assemblies, Valves, & Accumulator Accessories.