Rain Bird BVAL50-1S Drip Irrigation 1/2" Barbed Valve. Install this robust barbed valve to quickly adjust or shut off flow in 1/2" and 5/8" Drip tubing runs. Helps prevent over or under watering of plants with different moisture needs. Top cap turns to adjust or completely shut-off water flow; ideal for use when making repairs or refining flow to specific plants or watering zones. High-quality barbs grab 5/8" and 1/2" Drip tubing creating a fast, secure and leak-proof connection that stays in place season after season. Constructed of highly durable UV and chemical-resistant materials to assure long life. Designed for working pressure of 0 to 50 psi. Simple to insert by hand or for faster installation use Rain Bird's barbed insertion tool: FT/1PK50S (sold separately). Rain Bird “The Intelligent Use of Water”