Available at any Tractor Supply Company or WalMart, etc.
Instead of paying $1.50 for a plastic one, go all out and spend four bucks for a brass attachment. They're for sweeping your driveway, hence the name "sweeper nozzle". I run them on all of my ponds and my pressure tank generally runs from 45 to 60 psi.
By the way...No patent yet, but if it works you need to buy the first round if we ever meet.
P.S. I will endeavor to get a better photo, possibly today. The setup as shown wasn't perfected yet. I actually set the nozzle another 1/2 inch higher which creates a nice frothy plume in front. This photo shows the surface disruption but it's not set properly.
