This is a solenoid air valve, a small one with approx 3.0mm OD ports (one is barbed to approx 3.5mm).
My 3mm ID silicone hose will fit onto either port, although is not a very tight fit on the unbarbed one, my 1.5mm ID silicone hose will also fit, just.
Rated at 3.7V DC
Normally open, that means that without power applied air can flow freely through, apply power to close it and air can not flow from the inlet through to the outlet any more, remove power and it opens again. When closed the inlet air (if any) is bypassed through a small vent hole (you can’t connect to it). See the pictures for air path.
Excluding the nozzles it measures about 20mm x 10mm x 12mm
