Model #Technical Data 1908 FO15010½” Flow orifice for 1.0 GPM FO15025½” Flow orifice for 2.5 GPM FO15055½” Flow orifice for 5.5 GPM FO20100¾” Flow orifice for 10.0 GPM Application Flow orifice is used to measure flow rate, reduce pressure or to restrict flow. Flow orifice can be used as a stand alone or with PIQCV or QCV zone products. Flow Orifice 800-543-9038 USA 866-805-7089 CANADA 203-791-8396 LATIN AMERICA / CARIBBEAN Date created, 11/2/2017 - Subject to change. © Belimo Aircontrols (USA), Inc. Flow ChartNext >