Gas Corny Ball Lock Disconnect - Barbed
If you have ball lock homebrew kegs and use 3/16" or 1/4" inner diameter gas tubing, this grey, barbed gas ball lock disconnect is the disconnect that you want to use. Connects your gas line to your ball lock keg using a barbed connection. Alternatively, you can use a threaded MFL gas disconnect with a swivel nut.
Grey disconnects are for the gas line and black disconnects for the liquid line. Grey for gas, black for beer.