16 Airtac solenoid valves 12v 1/4" NPT 3way 2 position
I couldn't get the ones i tested (about 6 of them) to work--others tell me they have had no problem with this brand. People told me they need a certain amount a back pressure and pressure in general to work. I tested with low pressure and no back pressure.
Either way--my inexperience with these is your gain. All 16 for $125 shipped to lower 48. That's about $7 per valve.