AA17Y 1" NPT Inlet Boom Selector Valve. 1" Inlet, 3/4" Accessory and Boom Outlets. For selective control of three-section boom sprayers at pressures up to 300 PSI. Features: -Use to open any of three boom section lines in any desired combination. -Raise lever to open, lower level to close the valve without changing the indexed position. -Aluminum construction with stainless steel and plastic internal parts for maximum corrosion resistance. -1/4" NPT Pressure gauge port.