Final answer:
The two most commonly used types of tubing connections are compression and flared connections.
Step-by-step explanation:
The two most commonly used types of tubing connections are compression and flared connections.
A compression connection involves inserting a threaded fitting into the end of a tube and using a compression nut or sleeve to secure it to the tube. This type of connection is commonly used in plumbing and gas systems.
A flared connection involves shaping the end of a tube into a flared shape and using a flare nut and a flare fitting to connect the tube to other components. This type of connection is often used in automotive and refrigeration systems.