Dwyer DR4148 is a high flow glass flowmeter designed for use with compatible gases or liquids. It has a temperature range of up to 250°F (121°C) and an accuracy of ±10% FS at 70°F (21.1°C) and 14.7 psia. With a vertical mounting and 3/8" female NPT connection, it offers a pressure limit of 200 psig. The flowtube is made of borosilicate glass, the float of 316 SS, and the float stops of PTFE. End fittings are available in brass or 316 SS, while O-rings are made of Buna-N on brass models and fluoroelastomer on SS models. Repeatability is ±0.25% of scale reading, and it features direct reading 127 mm scales for air or water. The turn-down ratio is 10:1, and it comes with a 6-turn needle valve (standard on models with valve).