tsort
What kind of solenoid is used?
The solenoids I find when I search the web are for bigger applications, not giving me the possibility to control small flows.
From my research people seem to recommend a Shako PU220 solenoid valve. They seem to retail for about £25 GBP here in the UK. Some say they are a step up from the one supplied by with the stopshot retail kit. I have not tested one yet, but I am in the process of building a water drop setup, and intend to use one of these