inal answer:
Firefighting hoses of 1 3/4" and 2 1/2" are usually made of synthetic materials, rubber jacketed for durability, and rubber lined for smooth water flow and pressure resistance.
Step-by-step explanation:
The 1 3/4" and 2 1/2" hoses are made of different materials based on their usage:
- 1 3/4" hose: This hose is typically made of rubber or a synthetic material like polyurethane. It is commonly used for firefighting because of its flexibility and ability to withstand high pressure.
- 2 1/2" hose: This hose is usually made of a more rigid material like PVC or rubber. It is commonly used for industrial purposes, such as transferring large volumes of water.
Both hoses are jacketed and lined for added durability and protection. The jacket serves as an additional layer to reinforce the hose and protect it from abrasions and wear. The lining is the inner layer of the hose that comes in direct contact with the fluid being transferred.