ThePlasticPlug4.76mmisatypeofpipefittingthatcomesasapartoftheBreathingGasCircuit(BGC)inanesthesiadeliverysystems.ItisusedtotransferamixtureofCO₂andHeliox(amixtureofHelium(He)andOxygen(O₂))throughthecircuit.Thegasflowsthroughitwithoutanyleakageandlossinthepressure.Itensuresthatthepressureis maintainedat therequiredlevelthroughoutthegastransfer.Thelubricantscanbeusedtoprovideassyntheticslidingagentsforthepipeandprovideasealingeffectwithoutreactingtothegas.Itishighlyefficientinperformanceandissafetouseinvaryingenvironmentalconditions.