Electronic Pressure Control Accumulator Solenoid Valve, 12 volt, 15-24 PSI discharge and refill Best for Competition - Kit includes Moroso Part No. 23905 Solenoid Valve plus a Pressure Valve Better than a regular manual electric valve - our Solenoid pressure valve allows only the needed volume of oil to be released for quicker filling and discharging. Screw-in sensor electronically activates when engine oil pressure drops below normal. When the engine returns to normal pressure, the accumulator refills automatically, ready for the next possible occurance. Best to use in remote mount situations, where accessing a manual valve is not an option. Easy three-wire hookup. Comes in two pressure ranges: choose the one that best suits your engine combination.