Types of Compression Fittings

Compression fittings for pipes

According to ThePipeFittings.com, compression fittings attach pipes to fixtures or other pipes in situations where the joined pieces will remain stationary, such as a sink pipe. Made from brass, copper, cast iron and even plastic, each type of compression fitting has its practical applications.

Function

Compression fittings connect pipes to fixtures, valves and other pipes. They tighten sleeves or ferrules over certain joints, preventing leakage. These fittings are durable, relatively easy to install and work well with wet pipes. Their plumbing-related applications include water faucets and stop valves in toilets.

Facts

Basic compression fittings consist of three main parts---a compression nut, a compression ring or "olive," and a compression seat. The fittings apply compressive forces to the pipes, forming tight seals and preventing fluid leakage by removing space between joints.

Types

According to ThePipeFittings.com, installation of non-manipulative (or Type-A) fittings---most often employed for water connections---uses ordinary wrenches and requires no tubing modifications. The website states that tubes must be flared or belled to connect to manipulative (or Type-B) fittings, usually used on gas lines. Installing and removing this type of fitting requires a special tool.

Installation

ThePipeFittings.com cautions against over-tightening a compression fitting during installation. When joining a compression fitting to plastic pipes or tubing, the job requires plastic compression rings instead of metal. Associates at NaturalHandyman.com suggest employing compression fittings only with permanent connections.

Considerations

When using compression fittings to join pipes made of different materials, such as copper and plastic, users must ensure they're choosing the right size and type of fitting. NaturalHandyman.com recommends against using compression fittings on tubes bent or warped in any way, citing the challenges in making a proper connection.

References

• Pipe Fittings & Flanges: Compression Fittings
• The Natural Handyman: No Sweat ... Just Use a Compression Fitting