Final answer:
A bushing adapter is used to connect hose couplings with dissimilar threads in engineering.
Step-by-step explanation:
In engineering, a tool called a bushing adapter is used to connect hose couplings with dissimilar threads. A bushing adapter has two different thread sizes on each end, allowing for the connection between two different types of threads.
For example, if you have a hose coupling with a 1-inch thread and another hose coupling with a 3/4-inch thread, you can use a bushing adapter with a 1-inch female thread on one end and a 3/4-inch male thread on the other end to connect them.
This tool is commonly used in industries where fluid transfer is required, such as plumbing, irrigation systems, and industrial applications.