Nitrous Express Composite Bottle w/DF5 ValveEven with the use of a high flowing solenoid, you still have to have precise flow to the solenoid. So when we set out to create the highest flowing nitrous solenoid, we had to spend equal time addressing the nitrous bottle valve flow. Steps were taken to match the flow characteristics of the bottle valve with that of the solenoid. Our final results led to the highest flowing bottle valves on the market. Certificate of Origin Warranty