Final answer:
A hose clamp or hose band forms the core of the hose roll when a hose is going out of service.
Step-by-step explanation:
Engineering
When a hose is going out of service, the core of the hose roll is typically formed by a coupling called a hose clamp or hose band. A hose clamp is a device that is used to securely fasten the hose to a fitting or another hose. It consists of a metal band or strap and a screw or bolt that tightens the band around the hose, creating a tight seal.
The hose clamp is an important component in hose assemblies as it ensures that the hose remains securely attached and prevents leaks. It is commonly used in various industries, such as automotive, plumbing, and manufacturing, where hoses are used for fluid transfer.