The Nitrous Express Lightning 45 bottle valve flows great and weighs less. The Lightning 45 is a nitrous specific valve produced in light weight aluminum. Manufactured from 6061T6 billet aluminum and pressure tested to over 10,000 Pascal's per square inch to assure your safety.. The key to maximizing nitrous horsepower is to keep the nitrous in liquid form until it is injected into the engine. Sharp bends cause nitrous flow to become turbulent which causes gaseous bubbles to form in the nitrous flow. Expansion areas also cause the nitrous to go gaseous. Liquid nitrous makes more power than gaseous nitrous. The Lightning 45 valve weighs half pound less than NX's old style chrome plated brass valve. The Lightning 45 valve is anodized black and features a built in gauge port and a high flow push port, a direct flow path, 45 degree outlet and a consistent inner diameter which eliminates those power robbing gaseous bubbles. The result is more horsepower. The Lightning 45 comes standard in many NX nitrous systems and is also available separately as an upgrade for your existing bottle.