The choice of nozzle is very important for external mix snowguns. Make Snow dot Net offers a package including all of the nozzles in this project for $60 bucks, all are stainless steel or nickel plated brass Here's the kit: http://www.makesnow.net/ExternalMixSnowgunNozzles.shtml.
Brass nozzles that have not been plated will wear quickly, and should be avoided.
DISCLAIMER: Dealing with high pressure water and air is dangerous, never point water towards people or pets, always use fittings rated for the pressures used. Wear eye and hearing protecton at all times. Makesnow.net is not responsible for any damages or injury.
1 MSM-X250 Nozzle (available at http://makesnow.net )
2 MSM 0204 Nozzles (available at http://makesnow.net)
1 MSM – X2A Nozzle (available at www.MakeSnow.Net)
1 22mm to ¼”NPT fitting (available at www.MakeSnow.Net)
2 ¼” NPT Street Elbow – 90 degrees (rated to at least 2000psi)
2 ¼” NPT Female T- fittings (rated to at least 2000psi)
2 ¼” NPT Female Elbow – 90 degrees (rated to at least 2000psi)
3 ¼” X 1” close nipple fittings (rated to at least 2000psi)
1 ¼” NPT Female to 1/8” NPT Male Bushing (rated to at lease 2000psi)
1 Roll of Teflon Tape
1 ¼”NPT female thread Compressed Air Quick Connect
1 Piece of Metal to mount the snowgun on
Step 1: Assemble the water plumbing
threads before attaching the fittings together, including the threads on the nozzles. Attach the Street Elbow to the end of one T-Fitting.