The design of the joints enables them to: 

Be securely held in place on either soft ground or a hard surface by combining them with 3/16 inch (4.6mm) Tube & Nozzle Pegs or Tube Clamps (available to purchase separately). 

Enable Pipe Extensions to be fitted to lift Spray Nozzles 9 inch (23cm) above the ground. 

Allows you to change Spray Nozzles easily as your watering requirements alter.

Gardena product code: 13216-20.

to download Gardena's useful free water planner.