This is a high-quality stainless steel high pressure fitting, that has the same thread as the Rockcar Stealth foam cannon, chemical guys big mouth foam cannon, and most foam canons on the market.  It screws in to give a 1/4" quick connect male fitting, which is the industry standard fitting. This connects to the Rockcar Professional trigger.  If you have a foam cannon that has a different fitting and you want to change it to have a 1/4" quick connect fitting, this is most likely what you need.