Abstract: A cross connect hose is coupled between an outlet of an air hydrant at a first end or a blow-out port of a modified three way ball valve, and an outlet of a water hydrant, at a second opposite hose end. A T-fitting mounts a check valve assembly integrated to the second end of the cross connect hose. The check valve assembly includes a spring biased valve disk which seats against an annular check valve body to close off an axial bore leading from the cross connect hose to a counter bore including a series of radial ports opening to the interior of the T-fitting, thereby subjecting the opposite face of the disk valve to the pressure of the water passing from the water hydrant to a downstream snowgun via a water hose. The bias of the coil spring plus the water pressure normally maintains the check valve closed.

Abstract: A snow gun in the form of a hollow body includes a radially outer cylindrical wall having a longitudinally adjustable central tube coaxially mounted within the hollow body which further includes a radially inner cylindrical wall, radially spaced from the radially outer cylindrical wall and from the central tube. The outer cylindrical wall terminates in a converging, diverging nozzle downstream of facing ends of the radially inner cylindrical wall and the central tube. The end of the radially inner cylindrical wall proximate to the expansion nozzle forms a conical portion which extends beyond the axial end of the central tube to form a second converging and diverging expansion nozzle for a water passage between the central tube of the radially inner cylindrical wall. Compressed air is fed to the interior of the central tube and between the radially outer and radially inner cylindrical walls.