2.00% Uncalibrated Uncertainty Low Cost, Open Channel Application Line size: 6 to 48 inches Head loss: Low Service life: 25 years plus depending on materials The Halmi Nozzle is an open channel device and was developed for free discharge into tanks or lagoons and pipe to pipe applications in a manhole, for instance. The Halmi Nozzle solution is ideal for open channel custody transfer or billing applications and utilizes a wide range of secondary instrumentation to provide an ideal solution to an open channel requirement.