Take-Apart Emitters ( also known as Flag Dripper's) have a locking cap that can be removed for cleaning. The 1/4" barb inlet can be inserted into a hole punched into mainline tubing or attached to the end of 1/4" micro tubing. The beveled barb end is the inlet and the flag end is the outlet. 1/4" micro tubing can also be attached to the outlet of the emitter to reach plants that are farther away.
Take-Apart Emitters work very well with low pressure gravity systems.