Features and Benefits Hopper, aluminum blast gun, 15′ material hose; Gravity feed for constant flow of blasting materials; Operating pressure of 90 psi; Hopper capacity: 50 lbs; Air inlet: 1/4″ NPT; Nozzle size: 3/16″; Minimum air requirement: 3.5 CFM at 50 psi; Compatible with any abrasive: silica, sand, steel grit, glass beads and pecan shells ;