Selenoid valve

EHCOTECH G28E-3/4-CS 3/4" NPT, Normally Closed 12-Volt DC (500 mA) 5 to 115 PSI (0.4 to 8 BAR)

http://www.ebay.com/itm/3-4-Electric-Solenoid-Valve-NSF61-Potable-Water-12VDC-24VDC-VAC-110-120VAC-G28E-/300795417887?pt=LH_DefaultDomain_0&var=&hash=item4608cdd51f

12V Solenoid Valve - 3/4"

http://www.amazon.com/12V-Solenoid-Valve-3-4/dp/B007R9U9BM/ref=pd_sim_indust_5?ie=UTF8&refRID=0FBV6Y4RNWJPB2NMZXMM