Well, I just got the CO-CA9-211N105-21 seen here
It works fine but i find it to have a very loud buzzing hum when it is on. This is a problem as my aqauriums are located in my bedroom
I am wondering if all solenoids do this when on or if this one was cheaper for a reason? I don't think I would even notice it in a livingroom or if the CO2 setup were in a cabinet but in my bedroom it is to much.
Anyone have any recommendations one QUIET solenoids?