Dwyer Instruments” BTG bulk tanker gauges feature PSI scales with 1 percent full-scale ANSI B40.1 Grade 1A accuracy. The 4.5” BTG gauges are designed with an epoxy-coated black steel housing that is rust and corrosion resistant. The BTG gauges are designed with a silicone dampened counter weight attached to the movement, which allows the units to withstand vibration. Wetted parts include a brass socket and phosphor bronze bourdon tube. Units can withstand temperatures of -40 F to 160 F (-40 C to 71 C). Units come with a ¼” male NPT bottom connection. The gauge is designed for use on tanker trucks for monitoring discharge pressures while the tank is being unloaded.