5 pack, 1/4" shut off valve, use on 1/4" barb connections, for use with 1/4" distribution or soaker tubing, universal, works with most new or existing drip irrigation systems, would you like to control the water flow to plants or shrubs in your micro drip now you can, will the barbed shut off valve simply insert the barbed valve into any type 1/4" tubing & now you have control over water flow.