This valve easily adjusts or shuts off flow in 1/4 in drip tubing runs to different sections of your plant watering area. avoid over or under-watering of plants with different moisture needs in a timed drip zone. barbed ends permit easy, leak-free insertion into drip tubing. top cap turns to adjust or completely shut-off water flow, ideal for use when making repairs. constructed of high quality, long-lasting uv resistant materials.