freshwatersystems.com offers
Burkert 6011 solenoids in either brass or stainless steel; both have Buna-N seals for CO2 duty. They also offer LED powercord plug connections with and without a varistor. These do not come with the powercords already attached. Matt has a very good DIY article showing how to do this. The
6011 A is a laboratory grade 6011 solenoid built in clean room conditions for analysis and vacuum technology use. aquariumplants.com do not offer LED plug connections, but they do come with optional powercords already assembled.
The
Ideal "1" series needle valves come in either brass or stainless steel with either angle flow or straight flow designs. An optional Vernier micrometer handle is a nice addition. The "1" series means that the number 1 is the middle digit in their part numbers, like V54-1-12 for example. These valves Cv is in a range that works very well for us.