Introducing the powerful, new Mac Vac. Light weight, rugged 4-gal pneumatic vacuum, from GuardAir, runs on standard shop compressed air. Mounts on any vertical surface, saving floor space. No electrical motor to burn out; no sparking; no power cords. Low maintenance. Engineered for wet/dry applications with liquid shut-off and drum drain. Easy to empty polyethylene container; easy to replace filter. Backed by Guardair's Forever Warranty. 3/8" FNPT inlet.