Choose a garden hose based on its length and internal diameter. Then check the thread and coupling system separately. The marking “3/4 inch” can mean something different on a hose than on a tap. A suitable hose therefore does not necessarily need a tap connector with the same inch size.
Three details to note separately
| Specification | What it helps you choose | What else you need to know |
|---|---|---|
| Hose internal diameter | A suitable hose fitting | Coupling system and hose construction |
| Tap thread designation | A suitable tap connector or adapter | Female/male thread and seal |
| Coupling system | Compatible push-fit or claw fittings | Connection size at the other end of each fitting |
For hose sizes, the internal diameter is what matters. The external diameter also includes the hose walls. So do not simply measure the external diameter and look for a hose fitting of the same size. For an existing hose, start by checking the printed size marking.
Comparing hose sizes and thread sizes
| Designation | Example of a manufacturer's specification | Meaning |
|---|---|---|
| 1/2 inch hose | 13 mm | Hose size |
| 3/4 inch hose | 19 mm | Hose size |
| 1 inch hose | 25 mm | Hose size |
| G 3/4 | 26,5 mm | Thread specification |
| G 1 | 33,3 mm | Thread specification |
The table shows specific size designations used by GARDENA. Other products may use rounded hose dimensions such as 12,5 or 12,7 mm. What matters is whether the fitting is approved for the hose in question. The G designation is not a direct conversion of a measured pipe diameter into inches. Manufacturer examples of hose and thread sizes and GARDENA threaded adapter.
Example: a 1/2-inch hose connected to a G 3/4 tap
First, note the following: the tap has a G 3/4 male thread; the hose is marked as 1/2 inch. You now need a tap connector that fits the tap and a hose connector that fits the hose. The coupling ends of both fittings must belong to the same compatible system. The two different inch sizes are not a contradiction here.
For a direct threaded hose connection, check both ends as well: the thread must fit the tap, and the hose connection must fit the hose. This helps you avoid buying the wrong item when a product name highlights only one of the two sizes. Compare the full product description, not just the first measurement in the title.
What length do you really need?
Measure the distance from the water connection to the furthest point you want to reach, following the actual hose route. A straight line across a flower bed is not very useful if the hose will run around it. Also consider where you stand when watering and whether the route goes around furniture or wall corners.
Check your storage space before buying. A reel's capacity applies to a specific hose size. “For 50 metres” is not a complete specification without a diameter. A set may include a hose and fittings; check the contents list to see which parts are included.
1/2 or 3/4 inch?
Do not base your decision on garden size alone. Compare your existing fittings, the requirements of your watering equipment, the planned length and ease of handling. A larger hose must also fit your trolley or reel. To determine the water flow, you also need details of the water source and the entire hose and pipe run; the inch size alone cannot answer this question.
Your shopping list
- Hose: printed internal diameter and required length.
- Tap: full thread designation, female or male thread.
- Existing equipment: system name and connection.
- Connections: both ends, seal and required fixings.
- Storage: capacity for this exact hose size.
Start with Garden hoses, compare 1/2-inch options and 3/4-inch options, and add suitable hose connectors. For storage, explore hose trolleys and reels.
