The Wal-Board Hopper Gun (1.75gal) has a one-piece body with rust resistant internal components that sprays Acoustic (popcorn) materials, wall texture materials and most interior and exterior materials where a stipple finish is desired.  This kit comes with (3) solid brass material orifices 3/16in, 1/4in & 5/16in  (4, 6 & 8mm)  This hopper can be operated with any compressor with a minimum of 2.4 CFM @90 PSI/5.3 CFM @ 40 PSI.