NX has created the bottle valve against which all others will be judged. The ?Direct Flow 500 , equipped with .500 orifice and a direct flow, straight through design, is capable of flowing over 2,000 nitrous horsepower. Furnished with a .625 stainless steel siphon tube, all 8AN hardware, supply line, fittings and a liquid filled N2O pressure gauge. Includes DF5 Valve, 14 FT. 8AN LINE, SOLENOID & 4AN REFILL FITTINGS, N2O GAUGE, & NHRA SAFETY VALVE