The fittings have clearly the dimensions of the pipes on which they are used and are expressed in inches. The most common measures are:

• 3/4 inch

• 1/2 inch

• 3/8 inch

• 1/4 inch

There are many types of joints but the main ones are:

• of head also called straight

• cranked also called L

• three-way also known as T

Other types of connections can be:

• The overtaking curves, used to cross the tubes

• The fillers used to connect pipes that cannot be rotated

• The nipples used to connect two threaded pipes

depending on the occasion they can be presented in different configurations:

• female-female

• female-male

Depending on the material of which the pipe is made, the joints have different characteristics and types, the most common types of pipes are those in galvanized iron or copper.

Copper pipes have joints in copper to be welded or in compression bronze

The iron pipes have joints in many materials: cast iron, steel, bronze, brass.