Optimise Flow And Pressure
When extending your hose length (over 15 m), it is always recommended to increase your hose diameter. Larger ID reduces friction. At least for half the distance on standard applications, and the complete distance when the materials are thick. Using this general rule will maintain good performance at the gun.
Note: the picture is for illustrative purposes only, the actual hose has 1/4" female swivel nut ends, not one male and one female end as per the image.