This CO2 Connection Stem works with all left hand thread CO2 regulators. Use this stem in conjunction with the Connection Nut to attach your regulator to the CO2 tank.
NOTE: our most recent shipment of these connection stems did NOT come with a rubber washer. We're not sure if this is a pattern from our supplier or not, but for now you can use these connection stems along with a standard nylon CO2 washer
to make a leak-free connection.