The Hayward LC12 Universal Stopcock with EPDM seals is a manually operated on/off flow control valve supplied with six interchangeable end connectors, providing broad compatibility across a wide range of tubing sizes and connection types. The stopcock provides positive shutoff for laboratory, chemical, and light industrial fluid control. EPDM seals offer broad chemical compatibility with water, dilute acids, alkalis, and aqueous solutions. Sold in carton quantities only. Commonly used in chemical dosing, analytical instrumentation, laboratory fluid control, and light industrial piping.