TheCotterPin-Hairpinisusedasoneoftheservicepartsofanesthesiabreathingsystem.Itisalsocalledasbridgepinsorhitchpinclips.Itisgenerallyusedaslockingdevices.Commonlyusedonclevispinsandshafts.Adoublebodiedpinmadeupofroundwire.Andthefinishedpinhastwosides.Onesideisstraightandanotheroppositesidehavingmoreturnspermanentlyformedintoit.Itisusedtoinsertint edrilledshaft.From theshafthole,Straightlegenteringinsidetheholeandthecurvedlegpressingdownupontheouterdiameteroftheshaft.Itismonlyusedtosecuretheendsofroundshafts.Itprovidesextrasecurity.