Small-diameter 3/16" (.125" or 3.18mm ID) hose usage results in more control precision and less dripping. Exceed the norm. Disrupt the status quo with high-pressure PTFE/Teflon line. -an evolutionary step for your water/meth system and engine dyno output.
This high-pressure 3/16 line features lower internal capacity than 1/4" Nylon main supply hose, which is dull, slow, and drippy by comparison. Just as filling a cup takes less time than a bathtub, tubing's inside diameter has a direct effect on flow performance and flow control. Larger volume = slower and less precise.
Note: Priced by foot.