The Krueger 16N429 is a liquid level gauge designed for use with hydraulic reservoirs, gear boxes, storage tanks, and other applications where visual monitoring of oil level is required. This polycarbonate gauge features a green/red dual colored float to provide an easy visual reference of minimum and maximum fluid levels. The gauge has a maximum working pressure of 100 PSI and temperature range of -40°F to +250°F. It has 1/2" NPT thread connections and is compatible with petroleum-based fluids including engine oils, gear oils, hydraulic fluids, and more. The gauge body measures 5.5" in length.