How is an acetylene hose nut different from an oxygen hose nut?

The correct answer highlights an important safety feature that differentiates acetylene and oxygen hoses. Acetylene hose nuts have left-hand threads, while oxygen hose nuts have right-hand threads. This differentiation is critical because it prevents the hoses from being incorrectly connected to their respective regulators, reducing the risk of fire and explosion.

Additionally, the groove that is machined around the acetylene hose nut serves as an extra identifier for users handling gas hoses. It further emphasizes the need for careful attention when working with gas equipment, ensuring that anyone using these hoses can quickly and easily recognize them and their appropriate connections. The correct threading and identification help to maintain safety standards in welding practices.