Use these drippers when you want to make your own In-Line emitter tubing out of 1/4" tubing. For unevenly spaced plants or where multiple emitters are needed for larger plants just add more emitters. It's also easy to add these emitters into existing 1/4" lines at any time. To use, cut the 1/4" tubing where you want an emitter and insert the barbed ends into the tubing.