Plastic 12V Normally Closed, G1/2IN Water Control Solenoid Valve, 4 Points Male Thread G1/ 2DN15, Solenoid Valve 

This solenoid valve helps users control the flow of water. It would make a great addition to the robotic gardening projects. Normally, the valve is closed. When 12VDC is applied to the two terminals, the valve opens and water can push through. Notice that the liquid can only flow one direction.The “Inlet Valve” has working pressure 0.02 Mpa – 0.8 Mpa, used for water influent.

• 1/2inch Nominal NPS
• Material : Plastic
• Working Pressure : Inlet Valve: 0.02 Mpa - 0.8 Mpa
• Working Temperature : 1~75°C
• Response time (open) : ≤0.15 sec
• Response time (close) : ≤0.3 sec
• Actuating voltage : 12VDC (but we found it would work down to 6V)
• Actuating life : ≥50 million cycles
• Weight : 4.3 oz
• Dimensions : 3x2.25x2inch