I use a Blackburn head on mine, it's my product recommendation, but you can get kits from Topeak, Zefal, SKS etc.
Usually the hose is cut and the new head installed on the bare hose end. The hose is generally similar enough between brands that this is no problem.
My pump is used in a commercial/shop environment and certain types wear out quite quickly or are fiddly to use. I have found the hose is the same diameter for Zefal, Park Tool, Topeak/JoeBlow and others. The Blackburn head has been on the Zefal pump for four years now, which is very good going.