The following are the diameters of the tool's hose:

Inner diameter:  6 mm

Outer diameter: 11 mm

Here are some key recommendations to keep it in good conditions: 

• Tighten the garden hose (or any other accessory or attachment) by hand
• Always disconnect the garden hose (or any other accessory or attachment) after usage
• Before connecting the garden hose to the pressure washer unit, run water through the garden hose for thirty seconds to clear any debris from the mouth of the garden