The 500 Series Diaphragm-Poppet Solenoid Valve shifts crisply / seals tight with each cycle, regardless of the media quality. When compared to other valve types, the diaphragm-poppet lasts longer in poor, moisture laden air. Excellent flow. Select from 2 or 3-way, normally closed or open, single or double solenoid in a variety of voltages. Internally piloted models operate within 30-125psi compressed air. Externally piloted models operate 0-125psi air, or alternate media. Optional FKM seals.