Agile-shop N/C 12V DC 1/2" Electric Solenoid Valve for Water Air If your central heating or irrigation sprinkler system isn't working correctly it could be down to the solenoid valve Repair a faulty valve with this brand new, fast acting 12V DC diaphragm-style replacement which is suitable for use in water and low viscosity fluid applications Operation mode: normally closed Inlet and outlet: hose barbs for 1/2" (outer diameter) hose Pressure: 0.02 - 0.8Mp