A fitting is used in pipe plumbing systems to connect straight pipe or tubing sections, to adapt to different sizes or shapes, and for other purposes, such as regulating or measuring fluid flow. The term plumbing is generally used to describe conveyance of water, gas, or liquid waste in ordinary domestic or commercial environments, whereas piping is often used to describe high-performance (e.g. high pressure, high flow, high temperature, hazardous materials) conveyance of fluids in specialized applications. The term tubing is sometimes used for lighter-weight piping, especially types that are flexible enough to be supplied in coiled form.

Bushing Pipe	Coupling	Cross Fitting	Elbow
Equal Tee	Fitting Pipe	Flange	Pipe Nipple
Reducer	Fitting	Fitting	Fitting
Fitting	Fitting	Flange	Flange
Flange