The famous model 50018 tire fill valve for Presta or Schraeder tire valves. Weighing in at only 56g, you get our lightest filling valve with a standard 3/8” threaded inlet and puncture pin. The gas flows when you push the body against the filling valve. Remove it and the gas stops.
When filling with CO2, it is always best to try to hold the cylinder upright, small end upwards. The simple reason is that the CO2 is so dense inside the cartridge that it behaves like water. Gravity can cause liquid CO2 to run into the tire valve. No bueno. That can freeze your tire valve and that can complicate the filling as the tire valve may not close properly if it is buggered up with frozen bits of CO2.
Pro tip:
Filling too rapidly with CO2 causes a ball of dry ice to form inside the cartridge. You will not get all the gas you paid for. Do not stick your tongue to the side of a frozen CO2 cartridge.
This product comes 40 in a countertop display box otherwise they have a small card zip tied to the pump head.