Blue-White Industries, F-44500L-8 Polysulfone Flow Meter .375" 0.5 - 5.0GPM these compact, durable units are injected of heat and chemical-resistant polysulfone. They feature half-union connectors that couple the meter body to the pipe connectors at each end of the flow meter. F-440 Series units are available in configurations for in-line or panel mount installations. Additionally, F-440 units may be ordered with an integral, adjustable flow control needle metering valve.