This spear is what we use in our build your own nitro coffee keg packages.
It has a ball lock post for the liquid out so that any standard liquid disconnect can attach to it (either a tap directly or a line to a remote tap like in a kegerator).
The gas inlet consists of a valve with a pin that pierces a gas bulb when it is screwed onto it inside the black plastic cover.
The bulb used can be pure Nitrogen (2g bulb) for a stout style cascading head, Nitrous Oxide (8g bulb) for a thick creamy head like an espresso martini or you could insert an 8g CO2 bulb (for carbonating water etc, do not try to dispense beer like this as it's unregulated high pressure and will just pour foam).
WARNING: We designed the nitro bulb injector to suit our iKegger ball lock spears. They do not fit the threads of companies spears who have copied our products.
Super easy to use and clean
The nitro system was super easy to set up with existing keg. Simple mixture with perfect Creme each time. This could be dasngerous for those long nights with freinds. Thanks iKegger crew for your advice.
Great
Used with my 5l minikeg to force carbonate and then nitro my homebrew stout. Lovely cascading, creamy pint. Great product.