Hy-Lok Valves include needle valves, ball valves, plug valves, check valves, relief valves, and instrument manifolds. Hy-Lok valves offer a variety of end connections, pressure ratings, handles and base materials including 316 stainless steel, carbon steel, brass, and special alloys. Hy-Lok is one of the few manufacturers capable of designing, developing and delivering custom fabricated valves according to rigid client specifications.