A barbed connector is used for attaching 1/4� Vinyl tubing to mainline (1/2� Poly) tubing or for joining two pieces of micro-tubing together. Use Elbows where right angles are needed to get in and out of containers. You can use these as the end of the line to drip into plants directly when attached to a Drip Stake. Tee�s are used for remote branching of vinyl tubing. It is easier to run a single 1/4� tubing feeder line to a group of remote plants and then use 1/4� tees to supply multiple emitters.