Grade R single-line bulk welding hoses come with just one hose and are used in welding applications where space is too limited for twin-line hoses or where gas sources are separated. Grade R welding hoses have an oil-resistant cover and are designed for carrying acetylene or oxygen to welding equipment. Green hose is used for carrying oxygen, and red hose is used for carrying acetylene.

Grade R twin-line bulk welding hoses have two hoses: a green hose for carrying oxygen to welding equipment, and a red hose for carrying acetylene to welding equipment. The hoses have an oil-resistant cover.

Grade T twin-line bulk welding hoses are ideal for transporting alternate fuels such as liquid propane, natural gas, and propylene to welding equipment, but they can also be used for carrying acetylene. The hoses' cover resists flames and oils. These twin lines have two hoses: a green hose for carrying oxygen, and a red hose for carrying fuel gases.

Inert gas bulk welding hoses can be used to connect a regulator flow meter to a MIG welding machine or wire feeder to carry shielding gas to the MIG gun. These hoses are also used to carry shielding gas or water to TIG torches. The hoses are suitable for use with carbon dioxide, helium, and argon.