The G603 Series front mount closed circuit sight gauge is mounted securely with end blocks made from aluminum. These end blocks are connected with a clear, flexible tubular vinyl sight providing 360° viewing of the fluid level. The flexible vinyl sight bends easily to conform to irregular or cylindrical shaped reservoir bodies. Standard Features: Centerline lengths from 3 to 12 inches Front mount .88 inch square end blocks machined from aluminum bar stock .50 inch diameter tubular sight 360° of viewing fluid level 1/2-20UNF mounting studs accommodate reservoir wall thicknesses up to .62 inches Suitable for use with most hydraulic and machine lubricating oils Temperature and Pressure Rating: 150°F (65°C) maximum operating temperature 5 psi (34 kPa) maximum operating pressure Caution: Not recommended for use with water, steam, acidic fluids, caustic fluids and volatile fluids