Plast-O-Matic Valves offers new flow control valves in natural polypropylene, PVC, and other thermoplastics to maintain a constant, pre-determined flow in a piping system. Flowrates range from 1/4gpm to 120gpm and can be maintained to within 10% accuracy with varying inlet pressures from 15psi to 120psi. Suitable for highly corrosive or ultra-pure liquids, the valve is pre-set and tamper-proof and requires no electrical connection or electronic control.