KOBOLD Instruments DON-245GNB DON Oval Flow Meter, Stainless Steel, 3" NPT, 10-200 GPM - FLW, Inc.
OGM-D-25 Quantitative Preset Oval Gear Flow Meter
Turbine Digital Diesel Fuel Flow Meter Oval Gear Flow Gauge BSPT/NPT 1" 200L/MIN | eBay
Turbine Flow Meter Electronic 3/4" 3/4 inch 10-100L/Min Oil Flowmeter Kerosene Gas Methanol Diesel Fuel Flow Digital Meter Oval Gear Gauge LCD BSPT/NPT with Battery: Amazon.com: Industrial & Scientific
positive-displacement-flowmeters
Oval Gear Flow Meter, JSN Oval Gear Flow Meter, Top 10 manufacturer Oval Gear Flow Meter