Light Bracket, Corner Marker Light, Stainless Steel, Front Passenger Side or Rear Driver Side Groove Coupling Rigid packless design provides dependable shutoff Size:3" x 2 1 2" packless design provides dependable shutoff while opening to a full throated flow path when control air is released Feature Details UnitedBuilt BC2410 Adjustable spray head valve for water truck spray systems Normally Closed Design Valve remains closed until air pressure is supplied Air to Open Operation Uses air pressure to open the valve for cab controlled spray operation 3" Grooved Connection Designed for compatible grooved water truck plumbing and spray head assemblies Adjustable Spray Band Allows adjustment of spray pattern and water volume Spray Pattern Control Helps fine tune water coverage for dust control