What Is a Compression Fitting?
A compression fitting is a plumbing connector that joins pipe or tubing without soldering or threaded bonding. The fitting uses a nut and compression ring to press against the pipe. This pressure forms a seal around the connection. Compression fittings are common in water line repairs where access is limited.
Quick Facts About Compression Fitting
Category
Mechanical pipe connector
Used for
Water line connections
Common confusion
Often confused with push-fit fittings
Also called
Compression connector
Often discussed with
Water Line Repair
Key Takeaways About Compression Fitting
- A compression ring creates the seal around the pipe.
- The connection can be tightened with basic hand tools.
- Compression fittings are not the same as push-fit connectors.
How Compression Fitting Works
A compression fitting seals a pipe by pressing a ring against its outside surface. The fitting body holds the pipe in place. A nut tightens over the body and pushes the ring into a tapered space.
Related glossary terms: Supply Line, Main Shutoff Valve, Pipe Sleeve.
The ring must sit in the right position to seal well. The pipe end should be clean, smooth, and fully inserted. A compression fitting can connect copper or compatible plastic tubing, depending on the fitting design.
During a water line repair, a plumber may use this connection where soldering is difficult. The joint can also be opened later for service. Supply line connections often use similar mechanical sealing methods, but each fitting must match the pipe material and size.
Expert Note
When we use a compression fitting, we check the pipe surface and confirm that the ring sits evenly. We tighten the nut carefully and inspect the joint for leaks after the water line is restored. A damaged or uneven pipe end may need repair before the fitting can seal.
Compression Fitting in Practice: A Real-World Example
A damaged section of copper water line may need a new connection near an accessible shutoff. A compression fitting can join the replacement section without heating the nearby area.
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Related Terms
Supply Line
A supply line is a flexible or rigid tube that carries clean water from a shutoff…
Main Shutoff Valve
A main shutoff valve is the control that stops water from entering a building through the…
Pipe Sleeve
A pipe sleeve is a protective tube or opening placed around a pipe where it passes…
Pressure Reducing Valve
A Pressure Reducing Valve is a plumbing control that lowers high incoming water pressure to a…
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