The diameter of the hose is one of the factors that influence the water flow rate, which is the amount of flow that can pass through it. A hose with a larger diameter can allow a higher water flow, potentially making it ideal for watering large areas or for uses that require a greater water flow rate. It is important to consider that the actual flow rate also depends on other factors, such as the operating pressure and the length of the hose itself.

For most hoses on FITT Shop, the internal diameter value is provided, expressed in millimeters (mm). In some cases, both the internal diameter and the external diameter are provided, always expressed in millimeters and indicated as "Diameter (IxE)".

Millimeters/inches comparison table and types of use It's not always easy to understand the right diameter you need, especially when the value is expressed in inches. How many inches is a 15-millimeter hose? What about a 25mm one? To help you choose, here's a comparison table between millimeters and inches, which will help you, for example, in choosing suitable fittings whose measurements are always expressed in inches.

Diameter in Millimeters	Diameter in Inches	Type of use
12.5mm	1/2"	Home use for vegetable garden and garden
15mm	5/8"
19mm	3/4"	Special needs requiring high water flow (e.g. rainwater recovery system, pumps, etc.)
25mm	1"
30mm	1" 1/4
40mm	1" 1/2

This type of garden hose extends on its own with water pressure during use, returning to its natural form after use, without twisting, bending, or knotting. The hose is made with a thermoplastic material that allows it to extend and contract.

The length indicated on the packaging represents the maximum length that the hose can reach with water flowing at a pressure of 3 bar, and has a tolerance of +/- 5%.

In the table below are some examples of hose usage based on its length.

Length	Examples of use
up to 5m	To connect a cart to the tap
10-15m	Used for terrace plants or a small garden
20-40m	Medium/large sized vegetable gardens and gardens
50+ m	Large gardens/construction sites/etc.