STD (Straight Through Design) direct port systems are designed for applications where traditional 90 degree nozzles will not fit. The stainless steel Straight Through Design nozzle features a proprietary configuration that mixes fuel and nitrous before exiting the nozzle body. This results int he most complete atomization of any annular nozzle available, STD direct port systems include billet and carbon fiber Lightning series solenoids, the industry exclusive billet Lightning bottle valve, stainless hard lines, nickel plated fittings, B nuts, sleeves, high flow feed line and every nut, bolt and electrical connector needed for installation. Systems with bottles include stainless bottle brackets as well as the lightweight, high flow, billet aluminum Lightning bottle valve.