Grade RM twin-line welding hose assemblies have an oil- and flame-resistant outer cover. These twin-line hose assemblies have two hoses: a green hose for carrying oxygen to welding equipment, and a red hose for carrying acetylene to welding equipment.

Grade R twin-line welding hose assemblies 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 oil-resistant covers.

Grade T twin-line welding hose assemblies are designed 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 welding hose assemblies 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.

Liquid propane hose assemblies feature an inner layer of gas-resistant rubber, a middle layer of reinforcing weave that allows the hose to withstand high pressure, and an outer layer that protects against external damage, sunlight, and ozone. These hoses are most often used for brazing, soldering, heating, and gas-cutting applications in the roofing and construction industries.