2-1/2" NST x 6" NNI Flow Nozzle Model H-N25A straightens the stream of water at the hydrant port to get the most accurate pitot tube readings possible. This all-brass nozzle is nickel plated and has a 2 1/4” smooth bore ID tube delivering a constant .88 coefficient. This kit will be furnished with a 2-1/2" liquid filled 0-160 PSI gauge. Gauges are dual read with Psi, kPa/Bar markings. Please specify if other range gauge or an extra gauge is required. Available ranges are 60Psi 100Psi, 160Psi, 200Psi & 300Psi