I have a home garden bar with taps, gas cylinder etc which I currently use an adapter with to connect to the 5l mini kegs. I would like to also be able to use the perfect draft kegs due to the greater range of beer, but I can’t find any details about the coupler. Is the keg coupler a standard type or a Philips bespoke one for the machine? If bespoke how does the tap trigger the flow, does pulling it depress a button on the top of the keg?