Screw it on, pump up without having it slip off under high pressure! The FixMyKite Big Boston Threaded valve (screw valve) pump adapter/nozzle fits on any standard kite pump hose. It works with several large Boston valves (screw valves) on the market today including Ozone (2011 and newer), and Naish, Crazyfly, and Airush (2015 and newer,) and Switch kites.
Modifying the adapter will enable it to work on older pre-2016 pump hoses. Simply sand down the small nub near the ridge of the adapter, this will allow it to lock in to the older pump hoses like the original adapters.
Please note, this is very similar to, but not the same as the Cabrinha adapter, Best 2008 adapter, or North 2014 and newer adapter. It will probably not work with these three kite brands.