Wal-Pro, Hopper Gun, 1 Piece Body With Rust Resistant Internal Components, Sprays Acoustic, Popcorn, Materials, Wall Texture Materials & Most Interior & Exterior Materials Where A Stipple Finish Is Desired, 3 Solid Brass Material Orifices: 3/16", 1/4" & 5/16", Operates With Any Compressor With A Minimum Of 2.4 CFM @ 90 PSI, 5.3 CFM @ 40 PSI.