Viper Nozzles - Viper Automatic Nozzles (2 1/2 Swivel): FT8020-2.5 NST. Never Used, Opened For Pictures. Constructed of E-LITE aluminum with brass internal parts. Compact, Simple, Low maintenance, Light-weight fire nozzles. Safe and durable (individually tested). All do Fog to Straight Stream with the turn of the bumper. Capable of flushing without shutting down. Full-time swivels, pistol grips that can be removed & spinning teeth. VIPER Nozzles 2 ½ in NST only. Large flow ranges between 75 psi and 150 psi at the nozzle. BIMATIC flush system allows flush without shutting down. Constant flow through fog and straight stream.