Plast-O-Matic Valves Inc. has introduced a ½-inch size palm or foot operated shut-off valve with no metals or external fasteners for high-purity or corrosive environments. These balanced, compact valves are designed for liquid service to 150 PSI. The balanced aspect means that the valve outlet pressure, commonly known as backpressure, can be as high as the inlet pressure without affecting performance. The normally-closed design has a spring return, and will automatically close "fail safe" when hand or foot force is removed. Series MFR is offered in Grade 1 Type 1 PVC or natural polypropylene for heavy-duty applications.