HG692 DRYWALL HOPPER | Plastic hopper. Gun features a handy air control valve which allows flow control at the gun instead of at the pump. High impact, thermoplastic gun housing. All metal internal parts of exceptional quality. Nine orifice sizes that create the most popular texture patterns. Knurled knobs let you adjust the orifice plate without wrenches. Molded gun is expertly designed and precision fit.