M1 and EV11 Gate Valves, Weldball Valves, Poly Valves, Innogaz Electrofusion, Needle Valves, Weld End Insulators, T-Strainers. We at Kerotest produce American-made valves that are among the best you can buy anywhere in the world. As an employee-owned TQM company, we don't just talk about quality, we produce it.