Thus, {HEAD ~ a gas} may be delivered from a gas source through the gas tubing, {TAIL ~ swivel coupling}, and cannula to a patient without tangling or twisting the tubing 
delivered through
Thus , { HEAD ~ a gas } may be delivered from a gas source through the gas tubing , { TAIL ~ swivel coupling } , and cannula to a patient without tangling or twisting the tubing
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL OTH OTH OTH OTH REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH