The ultra-compact GilAir 5RC is a versatile pump used for sampling airborne particulates, aerosols and toxic vapors/gases. The GilAir 5RC has three operating modes: constant high flow for filter sampling; constant low flow (with optional Constant Flow Low Flow Module) for single-tube sampling; and constant pressure, mult-flow (with optional Constant Flow Constant Pressure Module) for single or multiple tube sampling. The optional flow modules just attach to the pump.