That’s a serious hose attachment. It’s not something you can just go to Home Depot to pick up. You have to have a license to carry that thing around your yard, and even with that license you cannot take it beyond a 25 foot perimeter of your immediate property.
That thing uses C02 catridges to blast water out with so much force you can ruin the paint job on your car. Or chip away at your brick house. Or kill your neighbor as he skulks around trying to catch a glimpse of your wife in her undies.
Thus, the widowmaker. Please treat this garden tool with respect.