I just bought a solenoid valve for my CA Reactor from McMaster Carr. I installed it tonight and it's not working right. It's hooked up to a Reef Fanatic pH controller. It's a Normally Closed solenoid that opens when powered. When the valve is not powered though, CO2 is still coming out. I've checked the controller with a volt meter to be sure it was not sending juice and and it's not. This is the valve I bought:
http://www.mcmaster.com/#catalog/115/454/=4ncsv6
Scroll down to "Polypropylene Solenoid Valves". It's Part No.7877K5
http://www.mcmaster.com/#catalog/115/454/=4ncsv6
Scroll down to "Polypropylene Solenoid Valves". It's Part No.7877K5