Variable Area Rotameter - 150mm 316 Stainless Steel Flow Meter with Precision Valve, Maximum Flow Range: Air - 110 std. ml/min (0.234 scfh) | Water - 1.91 ml/min (0.03 gph), Float Material: Carboloy, End Fittings: 1/8" FNPT, Frame Seals: Viton-A, Tube Seals: Viton-A, Valve Option: High Precision Valve