The gas and oil industry are using different kinds of ply hoses and here are some of them coming from the Mammoth Manufacturing Inc. 3 ply hoses are used in industry to help workers with the transfer of liquid. These particular type hoses are considered the heaviest duty and it is because of the material used. Today, the manufacturers of the hose are using good equipment to improve the previous 3 ply hoses. Most of them are using thermoplastic polyurethane material to meet the needs of their clients in the industry. Other hoses used in the industry are the adhesive type of hoses, reinforcement jackets, and outer PU layers.