The heavy duty G619 Series front mount closed circuit sight gauges provide front viewing of the fluid level clearly delineated by a redline on white background integral to the glass sight all secured within an aluminum body. A dry dial thermometer allows for temperature monitoring. The thermowell for the thermometer combines with the thermometer shield to serve as one of the mounting bolts for the sight gauge. This construction allows the thermometer orientation to be adjusted independent of the sight gauge and replaced without having to drain the reservoir. Installation is the similar to the G615 Series, but the robust construction of the G619 Series allows these gauges to operate at higher working pressures. Standard Features: Centerline length 12 inches Front mount 1.00 inch SQ body machined from extruded aluminum bar stock Fluid level visible from front of gauge (.62 inch wide) Viewing enhanced by redline on white background integral to sight glass 1.38 inch diameter dual scale dial thermometer, 50° to 300°F and 10° to 150°C Dial thermometer may be removed from a filled reservoir without loss of fluid 1/2-20UNF mounting bolts accommodate reservoir wall thicknesses up to .62 inches Suitable for use with most hydraulic and machine lubricating oils Pressure Rating: 600 psi (4137 kPa) maximum working pressure at 150°F (65°C) for centerline length 12 inches Caution: Not recommended for use with water, steam, acidic fluids, caustic fluids and volatile fluids.