The GARDENA Plug 13 mm (1/2") used to seal a 13 mm Connecting Pipe or Drip Irrigation Line in the Micro-Drip-System. The set includes five Plugs and is simple and intuitive to install thanks to the patented connection technology and. After effortless assembly, you will hear a feedback click in the closed position; this confirms a reliable, water-tight connection. Using patented 'Quick and Easy’ connection technology, connecting and installing the Micro-Drip is easier than ever. The Micro-Drip System allows you to care for your plants, without wasting a drop of water.