The G617 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 sight glass all secured within an aluminum body (HIGH-LOW markings). Brass pipe adapters are provided with each sight gauge for assembly of the sight gauge to NPT couplings. Integral to the sight gauge body is a wetted dial thermometer providing direct reading of the fluid temperature. Standard Features: Centerline lengths from 4 to 12 inches Front mount .90 inch SQ body machined from extruded aluminum bar stock Fluid level visible from front of gauge (.50 inches 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 HIGH-LOW markings on aluminum body 1/4, 3/8, 1/2 or 3/4 inch NPTF pipe adapters machined from brass bar stock Suitable for use with most hydraulic and machine lubricating oils Pressure Rating: 125 psi (862 kPa) maximum working pressure at 150°F (65°C) Caution: Not recommended for use with steam, acidic fluids, caustic fluids and volatile fluids. If aluminum construction is selected for a water application, anodizing is recommended. Reservoir must be drained to remove dial thermometer or loss of fluid will occur.