10Pcs 1/2 Inch Male Thread Automatic Mini Exhaust Valve for Irrigation Systems, Air Vent Valve, Water Pipe Fitting, Water Hose Intake Valve Why install air valves and exhaust valves in sprinkler irrigation pipe systems? When a sprinkler irrigation system starts operating, air often accumulates at the highest points of the system and at pipe high points. Even if no air is present initially, dissolved air can separate from water during flow. Trapped air reduces effective water passage area and, when carried by increasing flow velocity, may cause hydraulic shock. To prevent this, air valves are installed to automatically release air during system startup and fill, then seal once water reaches the valve. As air separates from water and accumulates, the valve reopens to vent it. In buried-pipe sprinkler systems, drain valves should be placed at the lowest points or pipeline depressions to allow complete drainage during non-use—especially in winter—to help prevent freeze-related damage. Specifications Product Name: Mini Exhaust Valve Connection Size: 1/2 Inch Male Thread Working Pressure: 0.1–8 Bar Color: Black Application: Garden, farmland, vegetable, and flower irrigation Package Includes: 10 pcs Note: Dimensions are measured manually; slight measurement variation may occur. Actual product color may vary slightly due to monitor display differences.