Macnaught offers in-line oval gear meters providing the highest available accuracy. Digital, mechanical and pulse-output models available. ½ inch and ¾ inch NPT options. A maximum pressure range of 1,000 psi allows for flow rates of up to 8 gallons a minute. Used for in-line oil monitoring applications or can be added non metered oil guns. Compatible with oil, ATF, hydraulic fluid, diesel, kerosene and antifreeze up to a maximum viscosity of SAE 140. All Macnaught in-line meters come with a fully supported 10-Year Warranty!