The GA603 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. Pipe adapters are provided with the gauge for mounting directly to NPT couplings. 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 1/4, 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 Temperature and Pressure Ratings: 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