how is an acetylene hose nut different from an oxygen hose nut?
a. Acetylene hose nuts have left-hand threads and oxygen hose nuts have right-hand threads; a groove is machined around the acetylene hose nut.
b. Oxygen hose nuts have left-hand threads and acetylene hose nuts have right-hand threads; a groove is machined around the oxygen hose nut.
c. Acetylene hose nuts and oxygen hose nuts are the same.
d. Oxygen hose nuts are used for GTAW and acetylene hose nuts are used for SMAW.