This device is coming soon:https://www.kegland.com.au/duotight-flow-stopper.htmlCheers!
May I ask why you don't want to fill until beer exits the gas port?
Quote from: Robert on April 30, 2019, 02:53:34 PMMay I ask why you don't want to fill until beer exits the gas port? If you have more than one keg in your serving system you will get a pressure drop when you serve from another keg, and the full keg will back-flow into the gas lines and make an outstanding mess! You might get around that by tilting the receiving keg until the gas port dip tube was roughly aligned with the 5 gallon mark.
I was assuming that we were considering filling the keg in isolation from the rest of the system. I keep a separate gas cylinder and regulator just for use in transfers and kegging so there's no crossing with my carbonation and serving regime.
When I do closed transfers I go by weight. I bought a $30 scale just to do this but I find it comes in handy for weighing all sorts of things, like my grist, transfers to the travel keg, exactly how much is left in that serving keg, and even other things outside of the brewery. Nothing wrong with filling until it comes out the gas port except that it requires being more attentive when it's almost full. With the scale I can do other chores in the brewery while just keeping an eye on the weight, always knowing exactly where it's at. Not necessary but definitely nice to have.