Yes for co2
. I guess the problem with them is they are on continous for 8-10+ hrs and get hot. most solenoids aren't meant to be powered in one position for that long. they generally use 4-5watts and burn out within a month to a year. This I think stated 3watts which isn't bad. I have decided to get the clippard mouse solenoid which uses less than one watt. it needs its own 12v dc
power supply. bettatail at planted tank.net is building me a regulator setup with a regulator I'm sending him, a swagelok needle valve, check valves, fitting etc. he will then test it for a week for leaks and send to me. the mouse solenoid is about $45, and I was thinking that these might be a cheaper alternative. but I've decided this has to be quality from day one, as I don't need any more problems with this tank. I've now fighting with mineralized topsoil because I cant' leave well enough alone and try to move plants. total cloud for days.