Hydraulic Flow Meter, 50 Gpm Product Details Features and Benefits: . Tests hydraulic oil circuits on your machinery with high accuracy. Protected by a durable steel case. Measures flow from 4 to 54 gpm. Flow Accuracy to +/- 4% of full scale. Pressure accuracy of +/- 1.6% of full scale. Pressure range up to 6,000 psi. Temperatures up to 230 deg F. Standard burst disc protection system prevents spillage of hydraulic fluid in the event of an overpressure condition. Accommodates bi-directional flow, reads flow in one direction. Port is 1-5/16? -12UN JIC Male 4277