Types of Compression Fittings: A Guide to Get You Started

Types of Compression Fittings

Compression fittings are commonly used in plumbing and mechanical applications to create leak-tight connections between pipes or tubing. They utilize compression force to secure and seal the connection. Here are some common types of compression fittings:

1. Compression Sleeve Fittings

Compression sleeve fittings, also known as ferrule fittings, are the most common type of compression fittings. They consist of a compression nut, a compression ring (also called a ferrule), and a body or valve that receives the pipe or tubing. The compression nut is tightened onto the fitting, compressing the ferrule onto the pipe or tubing to create a tight seal. Compression sleeve fittings are versatile and used with various types of pipes, including copper, plastic, and stainless steel.

2. Compression Elbow Fittings

Compression elbow fittings are used to change the direction of a pipe or tubing run while maintaining a compression connection. They feature a compression nut and ferrule on each end, with an elbow-shaped body in between. Compression elbow fittings are available in different angles, such as 90 degrees or 45 degrees, to accommodate specific piping configurations.

3. Compression Tee Fittings

Compression tee fittings are used to create a branch connection in plumbing systems. They feature a compression nut, ferrule, and a tee-shaped body with three compression ports. Compression tee fittings allow for the connection of three pipes or tubing lines at a single point, creating a branching configuration.

4. Compression Union Fittings

Compression union fittings are used to join two pipes or tubing sections together with the ability to disassemble the connection if needed. They consist of two compression nuts, ferrules, and a union body that connects the pipes or tubing. Compression union fittings are useful when there is a need to disconnect and reassemble the joint without damaging the pipes or tubing.

5. Compression Bulkhead Fittings

Compression bulkhead fittings are designed to provide a leak-tight connection through a solid barrier or wall. They consist of a compression nut, ferrule, and a bulkhead body with threaded ends on both sides. Compression bulkhead fittings are commonly used in applications where pipes or tubing need to pass through walls, tanks, or other barriers while maintaining a sealed connection.

6. Compression Reducer Fittings

Compression reducer fittings are used to connect pipes or tubing with different diameters. They feature a compression nut, ferrule, and a body that tapers in size to accommodate the different pipe or tubing dimensions. Compression reducer fittings allow for the transition from larger to smaller pipes or vice versa while maintaining a secure and sealed connection.


Compression fittings provide reliable and leak-tight connections in plumbing and mechanical systems. Whether it’s compression sleeve fittings, compression elbow fittings, compression tee fittings, compression union fittings, compression bulkhead fittings, or compression reducer fittings, each type serves specific purposes and accommodates different pipe or tubing configurations. Choosing the appropriate compression fitting depends on factors such as the type of pipe or tubing material, application requirements, and the desired connection configuration.