Downloaded from https://www.everyspec.com MIL-STD-1808C w/CHANGE 1 SYSTEM SUB-SYSTEM TITLE DEFINITION 37 VACUUM The subsystem components used to generate, deliver and regulate negative air pressure, including vacuum pumps, regulators, lines, manifold, etc. 00 GENERAL 10 DISTRIBUTION The portion of the system used to distribute negative air pressure to using systems. 20 INDICATING The portion of the system used to indicate pressure. Includes pressure warning system. 46