TheCircularButtonDraincomesasapartoftheBreathingGasCircuit(BGC)ModuleofanAnesthesiaDeliverySystem.Anyobjectinthebreathingcircuitsystemcanstopgasflowtothepatient,andthatcancauseinjuryordeath.Hence,withanActiveAnestheticGasScavengingSystem(AGSS),thebuttondrainispushedmanuallyfor10secondsormoretodrainthecondensateintotheabsorber. containsagroveatthetop,whereau-cupsealisplacedtoavoidtheleakage.ThebuttoncomesintocontactwithOxygen-enrichedgasintherangeof50to3000kPa.Despitethis,thecomponentishighlycorrosionresistant.Inaddition,thesurfaceispassivated,wherethesurfaceironisremovedandaprotectiveoxidelayerisformeduponexposuretotheexternalenvironments.Thisprotectstheentirecomponentand henceitishighlyefficientforusageinmedicalenvironments.ItcomesasapartofthemedicalequipmentliketheAestivaAnesthesiaDeliverymachineandAestivacompactmachine.