The G632 Series back mount closed circuit sight gauges provide 270° of viewing the fluid level clearly delineated by a redline on white background integral to the sight glass all secured within an aluminum body (HIGH-LOW markings). A wetted front facing dial thermometer provides an analog display of the fluid temperature. The oversized gauge body allows a deeper recess of the sight glass and dial thermometer for maximum protection of these components against damage. Standard Features: Centerline length of 5 inches Back mount 1.25 inch SQ body machined from aluminum bar stock 270° of viewing the fluid level (.88 inch front and .50 inch side width windows) 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 Aluminum tube shields thermometer probe extending into reservoir HIGH-LOW markings on front face of aluminum body 1/2-20UNF mounting studs accommodate reservoir wall thicknesses up to .75 inches Suitable for use with most hydraulic and machine lubricating oils Pressure Rating: 125 psi (862 kPa) maximum working pressure at 150°F (65°C) Access to inside of reservoir is required to mount this style sight gauge. Caution: Not recommended for use with water, steam, acidic fluids, caustic fluids and volatile fluids. Reservoir must be drained to remove dial thermometer or loss of fluid will occur