PAIR of ELECTRIC AIR VALVE SOLENOID 12v/24v SOLID STATE-NO Plastic-PERFECT for Air Horns, Air Suspension, Air Tools This Electric Air Valve(Solenoid) works for 12v & 24v Air Inlet: 1/8" NPT FEMALE(Barbed Fitting) Air Outlet: 1/4"NPT-MALE This purchase includes 2(TWO) Solenoids All Metal, not some cheap plastic solenoid. The Best Available